STARTUP AND ADJUSTMENT OF VPF-20
Poly-A Dosage Rates
Initial use of Poly-A Tablets may cause filter pressures to rise within a few hours of application.
Pressure differentials and flow rates will indicate the need for backwashing. It is not uncommon that
a backwash is required within hours of an initial application of Poly-A, particularly if the pool water is
cloudy. Poly-A increases the filters efficiency and more dirt and smaller particles are trapped on the
filter for removal. Shorter then normal filter cycles are typical when Poly-A is first used. As these
particles are removed through backwash or filter cleaning the filter cycles will return to normal.
Sand Filters
For sand filters, a dosage rate of 1 ounce of Poly-A per square foot of filter area ( 1 Poly-A Tablet per
4 square feet of filter area) should be used. After each backwash, follow the instructions for refilling
the feeder. Once the pool water is clear, and depending upon bather load, the application of Poly-A
following every other backwash application may be sufficient to maintain water clarity. During active
use, sand filters should be backwashed at least once a week, even if influent and effluent gauges do
not indicate a need for backwashing.
D.E. Filters
For both vacuum and pressure D.E. filters, a dosage rate of 0.08 ounces of Poly-A per square foot of
filter area (1 Poly-a Tablet per 50 square feet of filter area) should be used. After each backwash fol-
low the instructions for refilling the feeder. Once the pool water is clear, and depending upon bather
load, the application of Poly-A following every other backwash application may be sufficient to main-
tain water clarity.
Cartridge Filters
For cartridge filters a dosage rate of 0.05 ounces of Poly-A per square foot of filter area (1 Poly-A
Tablet per 80 square feet of filter area) should be used. After each backwash follow the instructions
for refilling the feeder. Once the pool water is clear, and depending upon bather load, the application
of Poly-A following every other backwash application may be sufficient to maintain water clarity.
FILLING THE FEEDER
1. Close the 1/2” isolation valves on both the inlet and outlet sides of the feeder.
2. Open the air relief vent valve on top of the feeder and the drain on the bottom of the feeder. Allow
the feeder to empty.
3. Close the drain valve.
4. Remove the feeder lid.
5. Fill the feeder with the appropriate number of Poly-A Tablets for your filter type and size from the
table below. If the the filtration system calls for more product then the feeder can hold, the prod-
uct should be dispensed, and the feeder refilled until the proper quantity of product is delivered.
6. Close the air relief valve and replace the feeder lid.
7. Test the pool water to determine the pH. The pool water must be above 7.4 pH. The ideal pH
range for product performance is 7.5 to 8.0. Adjust the pH of the pool water as necessary.
8. Open the 1/2” influent isolation valve followed by the effluent valve. Using the 1/2” effluent valve
and the flow meter, adjust the flow rate through the feeder to between 0.05 and 0.1 gpm.
9. The Poly-A feeder needs no further adjustments until it needs needs to be refilled for the next
application of tablets.
CLEANING AND MAINTENANCE
TABLET HOPPER
1. Close the inlet and outlet ball valves.
2. Open the air relief valve and drain to allow the feeder to empty before removing the lid.
3. Rinse, brush, and clean out the basin with water to remove any residue.
4. Place Poly-A Tablets in the feeder.
5. Follow the instructions for filling the feeder.
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