Infiltrator TW-300 Service manual

Installation Site Selection
1. Avoid installation of the tank in vehicular traffic areas. The tank is
designed for non-traffic applications.
2. The maximum vehicle load is a 4,500-pound (20 kN) axle load at a
soil cover depth of 6 to 48* inches (150 to 1,200 mm).
*18-inch (450 mm) max. in Florida for Cat. 3 TW and IM-1060 tanks; 48-inch
(1,200 mm) max. in Florida for Cat. 4 IM-1060; 36-inch (900 mm) max. in
Massachusetts, New Hampshire, North Carolina, and Oregon.
3. The tank shall not be installed where the subsurface water level
outside the tank exceeds the height of the outlet pipe saddle. Follow
Table 4 guidelines.
Excavating and Preparing the Site
1. Unless buoyancy control measures are required, the excavation
width and length should be 12 to 36 inches (300 to 900 mm) larger
than the tank on each side. See Infiltrator IM- and TW-Series Septic
Tank Buoyancy Control Guidance document, available online at www.
infiltratorsystems.com, for specific excavation requirements.
2. Excavate to account for the height of tank. 55 inches (1,375 mm) for
the IM-1060, 51 inches (1,275 mm) for the TW-900 through TW-1500,
and 50 inches (1,250 mm) for the TW-300 and TW-500. Also account
for 4 inches (100 mm) of bedding (if required), and backfill thickness
(permissible cover depth is 0.5 to 4 feet (150 to 1,200 mm) of soil).
Note: If the water level outside the tank exceeds the height of the outlet pipe
saddle, tank structural integrity may be compromised. Follow Table 4 guidelines.
3. Inspect bottom of excavation to verify suitability of native soil for tank
installation. Soils with large, protruding, or sharp stones or other similar
objects that may damage the tank are not suitable.
4. The tank may be bed either in suitable native soil (see Backfilling the
Tank section) or a minimum 4-inch (100 mm) layer of pea stone, sand,
gravel, or other similar material having particles less than 3 inches (75
mm) in diameter.
5. Create a uniform, level bedding surface to ensure that the bottom of
the tank is evenly supported at the base of the excavation. Verify that
the base of excavation is flat.
the drill points provided at each of the inlet and outlet ports according
to the Inlet and Outlet Hole Locations section of this document. The
inlet and outlet may be drilled on either the sides or ends of the tank,
as required based on applicable codes and site conditions.
Florida, Indiana, Kentucky, Oregon, West Virginia and certain Texas tank inlet/
outlet holes are factory drilled.
3. The gaskets supplied with the tank are compatible with Schedule
40 and SDR 35 pipe using a 5-inch-diameter (125 mm) hole saw with
IM tanks, and a 5¼-inch-diameter (133 mm) hole saw with TW-Series
tanks.
4. Install the rubber gaskets at the inlet and outlet.
5. Using the tank’s integral lifting lugs, lower tank into excavation.
6. Slide the inlet and outlet pipes* through the gaskets.
*For North Carolina, the inlet pipe shall be a straight pipe with no tee.
7. Horizontally position the tee 1½ inches (40 mm) from the access
port rim as shown in the detail below. This allows the tee to fit into the
access port lid.
8. Install lids and risers (see Installing Risers section) as necessary.
Backfilling the Tank
Note: Infiltrator tanks do not require filling with water prior to backfill placement.
Water filling is advisable if tank is left in an open excavation that may fill with water.
1. Backfill with suitable native soil. If native soil is unsuitable, replace
unsuitable fraction with suitable soil.
2. Suitable soil shall include soil textural classes defined in the United
States Department of Agriculture soil triangle. Suitable soil textural
classes are based on the tank installation depth, as measured from
finished grade to the top of tank.
a). For a tank installation depth of 0.5 to 2.0 feet (150 to 600 mm),
suitable soil textures include:
Installing the Tank
1. Inspect the tank for damage before installation.
2. If the tank inlet and outlet penetrations are not drilled, drill holes using
vii. The following, assuming that the sand particle fraction by weight
(i.e. % that would be retained on No. 200 sieve, as per ASTM D2487)
is greater than 30%: silt loam, clay loam, and clay
viii. The following, assuming that the sand particle fraction by weight
(i.e. % that would be retained on No. 200 sieve, as per ASTM D2487)
is less than 30% and the soil is shown to be dilatant (refer to Step 5
below for simple dilatancy test to be conducted in the field): silt loam,
silt, clay loam, silt clay loam, silty clay, and clay
b). For a tank installation depth that is greater than 2.0 feet and up to 4.0
feet (600 to 1,200 mm), suitable soil textures include:
vii. Silt loam, clay loam, and clay having at least a 30% sand particle
fraction by weight (i.e. % that would be retained on No. 200 sieve, as
per ASTM D2487).
i. Sand
ii. Loamy sand
iii. Sandy loam
iv. Loam
v. Sandy clay loam
vi. Sandy clay
i. Sand
ii. Loamy sand
iii. Sandy loam
iv. Loam
v. Sandy clay loam
vi. Sandy clay
GASKET
INLET/ OUTLET
TEE (TYPICAL)
TANK
INTERIOR
TANK WALL
(IM-1060 SHOWN)
ACCESS
OPENING
LID
ACCESS PORT RIM
POSITION TEE 1.5 in (40 mm)
FROM PORT RIM
MOUND BACKFILL FOR
POSITIVE DRAINAGE
3 in (75 mm)
MAXIMUM
PARTICLE SIZE
PLACE SOIL IN
12 in (300 mm)
LIFTS AND
COMPACT
PLACE SOIL
BETWEEN RIBS
SUITABLE NATIVE
SOIL BACKFILL
SUITABLE SOIL COVER
12 - 36 in (300 - 900 mm)
6 in (150 mm) MIN. SOIL COVER
IM-1060 TANK END VIEW SHOWN FOR REFERENCE
TANK BURIAL DEPTH
6 in (150 mm) MINIMUM
48 in (1,200 mm) MAXIMUM
TW-300 and TW-500: 50 in (1,250 mm)
IM-1060: 55 in (1,375 mm)
TW-900 through TW-1500: 51 in (1,275 mm)
PLUS DESIGN BACKFILL DEPTH
SUITABLE NATIVE SOIL OR
GRANULAR MATERIAL
TW-300 and TW-500: 50 in (1,250 mm) IM-1060: 55 in (1,375 mm)
TW-900 through TW-1500: 51 in (1,275 mm)
IM-1060 TANK
SECTION VIEW
SHOWN FOR
REFERENCE
CREATE
BERM AT
HOLE EDGE
TO DIVERT
SURFACE
RUNOFF
septic tanks
oInfiltrator IM or TW tank
oAccess port lids (included)
o10 screws per lid (included)
oInlet/outlet gaskets (included)
oInlet/outlet tees*
oTape measure
oPipe, risers, etc.
oSocket wrench
oExcavator
oShovel
oLevel
o5-inch-diameter (125 mm) hole
saw (IM tanks)
o5¼-inch-diameter (133 mm)
hole saw (TW-Series only)
oUtility knife
oPVC pipe glue with primer
*tee inclusion varies by state/province
Materials and Equipment Needed
Infiltrator IM
™
- and TW
™
- Series
Septic Tank General Installation Instructions
IM-1060 TANK
SECTION VIEW
SHOWN FOR
REFERENCE
TW-300 AND TW-500: 50 in (1,250 mm)
IM-1060: 55 in (1,375 mm)
TW-900 THROUGH TW-1500: 51 in (1,275 mm)
POSITION TEE 1.5 in (40 mm)
FROM PORT RIM
ACCESS
OPENING
LID
ACCESS PORT RIM
INLET/OUTLET
TEE (TYPICAL)
GASKET
TANK
INTERIOR
TANK WALL
(IM-1060 SHOWN)
Note: Illinois
requires a 6-inch-
diameter (150 mm)
drop for inlet tee.
Before You Begin
Infiltrator Systems’ septic tanks must be installed according to
state and/or local regulations, which supersede the manufacturer’s
installation instructions. If unsure of the installation requirements for
a specific site, contact the health department or permitting authority.
WARNING: IMPLOSIONS MAY CAUSE SERIOUS INJURY
Follow Infiltrator Systems Inc. vacuum test instructions
OCTOBER 2011

Failure to comply with these installation instructions may invalidate the warranty.
Contact Infiltrator Systems’ Technical Services Department for assistance at 800-221-4436.
3. Backfill should not have stones greater than 3 inches (75 mm) in
diameter or excessive clods that do not break apart during placement
and compaction. Backfill must be capable of occupying the spaces
between the tank ribs.
4. Standard field soil classification methods shall be used to determine
the soil textural class.
5. Under most circumstances, the determination of soil dilatancy will
not be required. Dilatancy shall be determined in the field using a test
that does not require specialized equipment, per ASTM D2488, Section
14.3, and as described below.
a). Mold a ½-inch-diameter (13 mm) soil test specimen in the palm of
the hand. The test specimen shall be representative of the prospective
tank backfill soil.
b). Mold the test specimen, adding water if necessary, until it has a soft,
but not sticky consistency.
c). Smooth the soil ball in the palm of one hand with a spatula or equal.
d). Shake the soil sample by striking the hand vigorously against the
other hand approximately 5 times. Do not strike hand in a manner that
results in an injury.
e). Immediately following shaking, gently squeeze the soil in the palm
of the hand.
f). Repeat shaking test if necessary to evaluate soil.
g). Note whether water appears on the surface of the soil specimen
during shaking and squeezing.
i. If water appears on and disappears from the surface of the soil
specimen, the soil is dilatant, and is suitable.
ii. If no visible change or only a slight visible change in the soil
specimen occurs due to shaking or squeezing, the soil is not dilatant,
and is unsuitable.
6. Do not backfill top of tank before sidewalls are completely backfilled.
7. Place backfill around the four sidewalls in a progressive, alternating
manner, so that the backfill height along the four sidewalls is maintained
within a 12-inch (300 mm) tolerance.
8. Continue to place backfill along the sidewalls in 12-inch (300 mm)
lifts. Place backfill between the ribs on the sidewalls such that the space
between the ribs is completely filled with soil.
9. Compact backfill material either by hand tamping or mechanical
compaction (includes backhoe bucket). Compact each lift prior to placement
of next lift. Compact backfill from tank walls to excavation sidewalls.
10. Complete backfilling and grade the area.
11. A minimum 6-inch-thick (150 mm) layer of suitable soil must be
placed over the top of the tank. The balance of backfill placed to finish
grade above the tank may be either suitable or unsuitable soil.
12. Establish a strong stand of erosion-resistant vegetation.
Note: Grade to prevent the backfilled excavation from filling with surface runoff. If
the water level in the backfilled excavation exceeds the height of the outlet pipe
saddle, tank structural integrity may be compromised. Follow Table 4 guidelines.
Table 1: Tank models1and conditions requiring buoyancy control2
Water height
above tank
bottom
Soil cover depth above tank3
6” (min)
(150 mm)
12”
(300 mm)
18”
(450 mm)
Above outlet
pipe saddle
Do not install Do not install Do not install
36” (900 mm) to outlet
pipe sadle
4All models TW-300/500 None
30” (750 mm) to
36” (900 mm)
All models except
IM -1060 TW-300/500 None
24” (600 mm) to
30” 750 mm) TW-300/500 None None
Less than
24” (600 mm) None None None
1TW-300, TW-500, TW-900, TW-1050, IM-1060, TW-1250, TW-1500.
2See Infiltrator IM- and TW-Series Septic Tank Buoyancy Control Guidance for
more information.
3No controls are required for soil cover depths exceeding 12” (300 mm).
4The tank shall not be installed where the water level outside the tank exceeds
the height of the outlet pipe saddle. Follow Table 4 guidelines.
Failure to comply with these installation instructions may invalidate the warranty.
Contact Infiltrator Systems’ Technical Services Department for assistance at 800-221-4436.
MOUND BACKFILL FOR
POSITIVE DRAINAGE
3" (76mm)
MAXIMUM
PARTICLE SIZE
PLACE SOIL IN
12" (304 mm)
LIFTS AND
COMPACT
PLACE SOIL
BETWEEN RIBS
SUITABLE NATIVE
SOIL BACKFILL
SUITABLE SOIL
COVER FILL
12" - 36"
MINIMUM 6" SOIL COVER
(305 - 914 MM) IM-1060 TANK END VIEW SHOWN FOR REFRENCE
Table 2: Infiltrator Tank Nominal Volume Chart
Height1 TOTAL LIQUID VOLUME IN TANK AT INDICATED HEIGHT
TW-300 TW-500 TW-900 TW-1050 T W-1250 T W-150 0 IM-106 0
in cm Gallons Liters Gallons Liters Gallons Liters Gallons Liters Gallons Liters Gallons Liters Gallons Liters
0000000000000000
1 3 1 2 2 8 10 37 11 43 14 53 17 64 311
2 5 2 9 5 19 22 82 25 95 30 115 37 140 13 49
3 8 5 19 8 30 41 156 48 181 58 218 71 267 28 106
410 934 13 49 62 236 72 273 87 330 107 404 46 174
513 15 57 20 76 84 317 97 368 117 444 143 543 65 246
615 21 79 28 106 106 400 122 463 148 558 180 683 86 326
718 28 106 37 14 0 128 483 148 560 178 674 218 825 107 405
820 36 136 48 182 150 567 174 657 209 791 256 968 129 488
923 43 163 59 223 172 653 200 756 240 910 294 1,112 152 575
10 25 50 189 71 269 195 739 226 855 272 1,029 332 1,257 176 666
11 28 57 216 83 314 218 826 252 956 304 1,149 371 1,40 4 200 757
12 30 65 246 95 360 242 915 279 1,057 336 1,270 410 1,551 225 852
13 33 72 273 105 397 265 1,004 306 1,160 368 1,393 449 1,700 251 950
14 36 80 303 118 4 47 289 1,093 334 1,263 400 1,516 489 1, 849 277 1,049
15 38 87 329 130 492 313 1,184 361 1,367 433 1,640 528 2,000 303 1,147
16 40 95 360 142 537 337 1,276 389 1,472 466 1,765 569 2,152 330 1, 249
17 43 102 386 154 583 361 1, 368 417 1, 578 500 1,892 609 2,305 357 1,351
18 46 110 416 166 628 386 1,461 445 1,685 533 2,019 650 2,459 384 1,454
19 48 118 447 179 678 411 1,555 474 1,792 567 2,146 690 2,614 411 1,556
20 50 126 477 191 723 436 1,650 502 1,901 601 2,275 732 2,769 438 1,658
21 53 134 507 204 772 462 1,747 532 2 ,012 636 2,407 774 2,928 465 1,760
22 56 141 534 216 818 488 1, 847 562 2,126 671 2,541 816 3,091 493 1,866
23 58 149 564 228 863 515 1,948 592 2, 241 708 2,678 860 3,256 521 1,972
24 61 156 590 241 912 542 2,053 624 2, 361 745 2,819 905 3,425 549 2,078
25 64 164 621 253 958 569 2,154 654 2,475 781 2,955 948 3,589 577 2,184
26 66 171 647 265 1,003 595 2,251 683 2,587 815 3,086 990 3,747 605 2,290
27 69 178 674 277 1,048 620 2,346 712 2,695 849 3, 215 1,031 3,903 633 2,396
28 71 186 704 289 1,094 644 2,439 740 2,802 883 3,342 1,072 4,057 662 2,506
29 74 193 731 300 1,136 669 2,533 769 2,909 916 3,469 1,112 4,210 691 2,616
30 76 200 757 312 1,181 693 2,625 796 3, 015 950 3,594 1,152 4,362 719 2,722
31 79 208 787 324 1,226 718 2,717 824 3,120 982 3,719 1,192 4,514 747 2,828
32 81 215 814 336 1, 272 741 2,807 852 3,223 1,015 3,842 1,232 4,663 775 2,934
33 84 222 840 347 1,313 765 2,895 878 3,325 1,047 3,964 1,271 4,810 802 3,036
34 86 230 871 359 1,359 788 2,983 905 3,426 1,079 4,084 1,309 4,956 830 3,142
35 89 236 893 370 1,400 811 3,070 931 3,526 1,110 4,203 1,347 5,101 857 3,244
36 91 243 920 382 1,446 834 3,155 957 3,624 1,141 4,320 1,385 5,243 884 3,346
37 94 251 950 393 1,488 856 3,240 983 3,721 1,172 4,436 1,422 5,384 911 3,449
38 97 258 977 404 1,529 877 3,320 1,008 3,814 1,201 4,548 1,458 5,521 938 3,551
39 99 264 999 416 1,575 898 3,398 1,031 3,904 1,230 4,657 1,494 5,654 965 3,653
40 102 271 1,026 427 1,616 920 3,484 1,057 4,003 1,261 4,772 1,532 5,798 992 3,755
41 104 278 1,052 438 1,658 938 3,549 1,078 4,080 1,286 4,869 1,562 5,915 1,018 3,854
42 107 285 1,079 449 1,699 957 3,623 1,100 4,166 1,314 4,972 1,596 6,042 1,044 3,952
43 109 292 1,105 460 1,741 976 3,695 1,123 4,249 1,340 5,074 1,629 6,167 1,069 4,047
44 112 299 1,132 471 1,783 994 3,765 1,14 4 4,331 1,366 5,172 1,661 6,288 1,094 4,141
45 114 304 1,151 481 1,821 1, 011 3,829 1,16 4 4,406 1,390 5,263 1,690 6,399 1,118 4,232
46 117 310 1,173 490 1,855 1,025 3,878 1,179 4,465 1,410 5,337 1,715 6,492 1,142 4,323
47 119 313 1,185 498 1,885 1,036 3,923 1,193 4,517 1,427 5,402 1,737 6,574 1,165 4, 410
48 122 313 1,185 502 1,900 1,0 45 3,954 1,203 4,553 1,439 5,446 1,750 6,626 1,187 4,493
49 124 313 1,185 504 1,908 1,055 3,994 1,212 4,588 1,448 5,481 1,762 6,669 1,208 4,573
50 127 ––––––––––––1,228 4,648
51 130 ––––––––––––1,247 4,720
52 132 ––––––––––––1,265 4,789
53 135 ––––––––––––1,278 4,838
54 137 ––––––––––––1,287 4,872
1. Height measured from inside surface at bottom of corrugation in tank.
Short and Long-Term Groundwater Control
It may be necessary to implement groundwater control measures during
tank installation. Maintain dry conditions by expanding the excavation to
create a short-term groundwater collection sump for temporary placement
of a dewatering pump if needed. Long-term groundwater control measures
such as underdrains and interceptor trenches may be sensible if the site
is amenable to construction of a control system and such systems are
not prohibited by regulation or law, and the tank location is not subject
to flooding. Properly installed underdrains and groundwater interceptor
trenches may prevent the need for tank buoyancy control measures.
Installing Risers
1. Compatible risers include 24-inch (600 mm) diameter products such
as the Infiltrator TW-Riser, EZset by Infiltrator, PolyLok®, Inc., and Tuf-
Tite®Corporation, in addition to 24-inch (600 mm) diameter corrugated
HDPE and IPEX Ultra Rib®PVC pipe. Follow Infiltrator’s IM- and TW-
Series Septic Tank Riser Connection Guidance.
2. Oregon watertightness testing shall include filling with water at least 2
inches above riser connection, with no more than 1 gallon leakage per
24 hours, per OAR 340-073-0025(3).
Installing Pumps and Related Equipment
Pumps may be supported on a stable, level 16 x 16 inch (400 x 400 mm)
platform positioned on the bottom of the tank. Precast concrete block
is acceptable pump support material. One 16 x 16 inch block or two 8
x 16 inch (200 mm x 400 mm) side-by-side blocks may be used. The
support block(s) should be placed below an access opening and level
upon the tank bottom. If two blocks are used, they should be oriented
perpendicular to ribs on the tank bottom, if present, for stability.
Installation of products such as electrical conduit and wiring, pumps,
water level control equipment, valves, siphon equipment, etc. shall be in
accordance with the product manufacturer’s instructions and compliant
with applicable state or local rules and regulations. Appurtenances shall
be fastened to the tank riser system and not the tank body or access
opening rim. Where possible, appurtenances shall be installed to
facilitate maintenance and repair access via the tank access openings.
General Specifications
• Failure to comply with installation instructions may void warranty.
• Prior to ground disturbance, check for subsurface obstructions and
utilities in conformance with applicable requirements.
• Operating water temperature shall be less than 100° F (40° C).
• Tanks are not fire resistant. Store away from ignition sources.
• Removal of structural bulkheads is prohibited; removal of locking clips
on the IM-1060 mid seam connection is also prohibited.
• Suitable for potable applications only if the tank bearing an NSF/ANSI
61 certification mark, otherwise tank is recommended for use in septic,
rainwater/stormwater storage, and pump applications only.
• Infiltrator tanks are designed for installation underground. Contact
Infiltrator Systems for above-ground use requirements.
WARNING: IMPLOSIONS MAY CAUSE SERIOUS INJURY
Follow Infiltrator Systems Inc. vacuum test instructions
Installing Under Shallow Groundwater Conditions
Buoyancy control measures may be required if the Infiltrator tank is to
be installed with less than 18 inches (450 mm) of soil backfill cover, and
where the water level outside the tank has the potential to rise 24 inches
(600 mm) or more above the elevation of the tank bottom. Otherwise,
no control measures are required (see Table 1). The need for buoyancy
control measures must be determined based on backfill cover depth
and height of water outside of tank above the tank bottom according
to the following table. Refer to Infiltrator IM- and TW-Series Septic Tank
Buoyancy Control Guidance document for more information.

6 Business Park Road • P.O. Box 768
Old Saybrook, CT 06475
860-577-7000 • FAX [phone]
1-800-221-4436
www.infiltratorsystems.com
U.S. Patents: 4,759,661; 5,017,041; 5,156,488; 5,336,017; 5,401,116; 5,401,459; 5,511,903; 5,716,163; 5,588,778; 5,839,844 Canadian Patents: 1,329,959; 2,004,564 Other patents pending. Infiltrator, Equalizer, Quick4, and
SideWinder are registered trademarks of Infiltrator Systems Inc. Infiltrator is a registered trademark in France. Infiltrator Systems Inc. is a registered trademark in Mexico.
Contour, MicroLeaching, PolyTuff, ChamberSpacer, MultiPort, PosiLock, QuickCut, QuickPlay, SnapLock and StraightLock are trademarks of Infiltrator Systems Inc.
PolyLok is a trademark of PolyLok, Inc. TUF-TITE is a registered trademark of TUF-TITE, INC. Ultra-Rib is a trademark of IPEX Inc.
© 2011 Infiltrator Systems Inc. All rights reserved. Printed in U.S.A. TANK011011ISI_1
INFILTRATOR SYSTEMS, INC. (“Infiltrator”)
INFILTRATOR® SEPTIC TANK LIMITED WARRANTY
FIVE (5) YEAR MATERIALS AND WORKMANSHIP LIMITED WARRANTY
(a) This limited warranty is extended to the end user of an Infiltrator Septic Tank. A Septic Tank manufactured by Infiltrator,
when installed and operated in accordance with Infiltrator’s installation instructions and local regulation by a licensed
installer, is warranted to you: (i) against defective materials and workmanship for five (5) years after installation. Infiltrator
will, at its option, (i) repair the defective product or (ii) replace the defective materials. Infiltrator’s liability specifically
excludes the cost of removal and/or installation of the Septic Tank.
(b) In order to exercise its warranty rights, you must notify Infiltrator in writing at its corporate headquarters in Old Saybrook,
Connecticut within fifteen (15) days of the alleged defect.
(c) YOUR EXCLUSIVE REMEDY WITH RESPECT TO ANY AND ALL LOSSES OR DAMAGES RESULTING FROM ANY
CAUSE WHATSOEVER SHALL BE SPECIFIED IN SUBPARAGRAPH (a) ABOVE. INFILTRATOR SHALL IN NO EVENT
BE LIABLE FOR ANY CONSEQUENTIAL OR INCIDENTAL DAMAGES OF ANY KIND, HOWEVER OCCASIONED,
WHETHER BY NEGLIGENCE OR OTHERWISE. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION
OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THIS LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY
FROM STATE TO STATE.
(d) THIS LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY GIVEN BY INFILTRATOR AND SUPERSEDES
ANY PRIOR, CONTRARY, ADDITIONAL, OR SUBSEQUENT REPRESENTATIONS, WHETHER ORAL OR
WRITTEN. INFILTRATOR DISCLAIMS AND EXCLUDES TO THE GREATEST EXTENT ALLOWED BY LAW ALL
OTHER WARRANTIES, WHETHER EXPRESS OR IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF
MERCHANTABILITY, FINESSE FOR A PARTICULAR PURPOSE AND ANY IMPLIED WARRANTIES OTHERWISE
ARISING FROM COURSE OF DEALING, COURSE OF PERFORMANCE, OR USAGE OF TRADE. NO PERSON
(INCLUDING ANY EMPLOYEE, AGENT, DEALER, OR REPRESENTATIVE) IS AUTHORIZED TO MAKE ANY
REPRESENTATION OR WARRANTY CONCERNING THIS PRODUCT, EXCEPT TO REFER YOU TO THIS LIMITED
WARRANTY. EXCEPT AS EXPRESSLY SET FORTH HEREIN, THIS WARRANTY IS NOT A WARRANTY OF FUTURE
PERFORMANCE, BUT ONLY A WARRANTY TO REPAIR OR REPLACE.
(e) YOU MAY ASSIGN THIS LIMITED WARRANTY TO A SUBSEQUENT PURCHASER OF YOUR HOME.
(f) NO REPRESENTATIVE OF INFILTRATOR HAS THE AUTHORITY TO CHANGE THIS LIMITED WARRANTY IN ANY
MANNER WHATSOEVER, OR TO EXTEND THIS LIMITED WARRANTY.
CONDITIONS AND EXCLUSIONS
There are certain conditions or applications over which Infiltrator has no control. Defects or problems as a result of such
conditions or applications are not the responsibility of Infiltrator and are NOT covered under this warranty. They include
failure to install the Septic Tank in accordance with instructions or applicable regulatory requirements or guidance, altering
the Septic Tank contrary to the installation instructions and disposing of chemicals or other materials contrary to normal
septic tank usage.
The above represents the Standard Limited Warranty offered by Infiltrator. A limited number of states and counties have
different warranty requirements. Any purchaser of a Septic Tank should contact Infiltrator’s corporate headquarters in Old
Saybrook, Connecticut, prior to such purchase to obtain a copy of the applicable warranty, and should carefully read that
warranty prior to the purchase of a Septic Tank.
TW-Series Inlet and Outlet Hole Locations
Drill height markings are provided on the Infiltrator TW-900, TW-1050, TW-1250, and TW-1500 to serve as a guide for inlet and outlet hole locations.
Markings “A” (lower) and “B” (upper) are located at the inlet end. Markings “C” (lower), “D” (middle), and “E” (upper) (TW-900 only) are located at the
outlet end. Note: holes may be drilled at the end or side inlet and outlet locations. The circular centering symbol next to the marking letter indicates the
centerpoint location for the hole saw. The pilot drill bit on the hole saw should be positioned on the centering symbol to properly align the hole saw.
The drill height markings below are provided to set the inlet and outlet invert heights based on state and/or local regulations. The chart below provides
the proper inlet and outlet drill points. Note that state, provincial and local regulatory requirements take precedence over the information provided in the
table below.
Table 3: Inlet and Outlet Hole Locations
State or Province Inlet Drill
Location
Outlet Drill
Location
Invert Drop
(in) [mm]
Inlet Invert Height2
(in) [mm]
Outlet Invert Height2
and Liquid Level (in) [mm]
DE, FL, IA, MA, ON A D 2 [51] 42 [1,067] 40 [1,016]
AR, CA, CO, CT, ID, IN1, KS, KY1, MO,
MT, ND, PA, SD, VT, WV1B C 3 [76] 42.75 [1,086] 39.75 [1,010]
TX B D 2.75 [70] 42.75 [1,086] 40 [1,016]
All Others A C 2.25 [57] 42 [1,067] 39.75 [1,010]
Notes:
1. Florida, Indiana, Kentucky, Oregon, West Virginia, and certain Texas tanks are factory drilled.
2. Invert heights are measured from the lowest interior surface at the bottom of the tank.
3. Invert heights based on 4-inch-diameter (100 mm) inlet/outlet pipes.
IM-1060 Inlet and Outlet Hole Locations
Drill height markings are provided on the Infiltrator IM-1060 to serve as a guide for inlet and outlet hole locations. The IM-1060 is manufactured to have
an end inlet invert height of 47 inches (1,194 mm) above the interior surface of the tank bottom when using the drill height guide markings and 4-inch-
diameter (100 mm) pipes. The end outlet invert height is 44 inches (1,118 mm), corresponding to a 3-inch (76 mm) drop from end inlet to end outlet. The
side inlets have invert heights of 47.5 inches (1,207 mm), and side outlets have invert heights of 44.5 inches (1,130 mm). This corresponds to a side inlet
to side outlet invert drop of 3 inches (76 mm); a side inlet to end outlet invert drop of 3.5 inches (89 mm); and an end inlet to side outlet invert drop of 2.5
inches (64 mm).
Table 4: Maximum Allowable Subsurface Water Elevation
Tank Model
Vertical Distance to Maximum Allowable
Water Elevation Outside of Tank
A - From Top of
Tank
B - From Tank
Base
TW-300 13” (330 mm) 36” (900 mm)
TW-500 13” (330 mm) 38” (975 mm)
TW-900 11” (280 mm) 39” (975 mm)
TW-1050 11” (280 mm) 39” (975 mm)
IM-1060 13” (330 mm) 43” (1,075 mm)
TW-1250 11” (280 mm) 39” (975 mm)
TW-1500 11” (280 mm) 39” (975 mm)
Top of Tank
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