
3
Understanding priming and pump operation
Your pump is powered by an electric motor that directly aects your water ow rate. When the electric motor
is turned on it utilizes centrifugal force to generate velocity of the water. The water then ows into the
optional strainer pot if installed to lter out debris or if not, will ow directly into the pump housing. Water
continues its ow into the eye of the impeller where the water meets the impeller vanes and converts kinetic
energy into static pressure allowing the pump to maintain pressure and is then forced out of the pumps
discharge port resulting in continuous water ow for your waterscape oasis.
The Cascade High RPM pump is not a self-priming pump which makes it best suited for ooded suction
systems. This means that it is designed to best operate below the water source surface level. Because the
Cascade is not self priming it is recommended to install a rubber apper type swing check valve and a priming
pot to assist in priming unless it is on a gravity fed system. It is important to note that operating above the
water source surface level may negatively aect the pumps overall performance. After lling the pump
housing, intake pipe and priming pot (if present) with water and starting the pump, if there is no water in the
intake pipe between the swing check valve and the water source, a reduced ow may be noticed for a minute.
This is normal and will increase to full performance within a few minutes as long there are no obstructions or
air leaks. If after a few minutes, full ow is not achieved, shut the pump o and check connections.
Never use a spring loaded check valve as it will reduce or stop flow.
What to expect for priming cycle with swing check valve installed.
Essentially, when utilizing a properly installed swing check valve the priming process is less time consuming
and is more ecient. An optional priming pot is also helpful. When installing a swing check valve, be sure your
connections are properly seated and are airtight. The valve should be as low and as close to your source water
as possible to maintain constant pressure. The best installation location for a check valve is underwater when
possible, as this can provide an air tight t even without PVC adhesive. Some swing check valves have true
union connection ttings that oer easier access for cleaning when needed. The pump housing, intake pipe
and strainer pot (if present) are then lled with water until the intake pipe is full. Secure ttings tightly and
turn on your pump. With the swing check valve in place, your pump is fully primed. However, if after running
your pump you observe the water level decreasing continuously, this indicates there is either a blockage
limiting the ow or a union tting connection on the intake pipe is not airtight. Check all
connections for debris, crimping, or cracking and tighten or replace parts as needed.
What to expect for priming cycle without a swing check valve installed.
In installation applications where no swing check valve is installed, it is important to install a priming pot to
facilitate priming. The Cascade series is designed to operate as gravity fed or with a swing check valve and
priming pot installed. Without any of these factors in place, the system will not function properly. If working
with an installed priming pot, the lid should be removed, priming pot lled with water, lid replaced
ensuring all ttings are tight and sealed with PTFE paste or similar sealant. Do Not use PTFE tape.
Be sure all water supply valves are open, then connect the power supply to start the pump. It is important to
note that the resulting water ow may initially be very little for the rst few minutes. If at anytime, no water is
owing into the priming pot, the pump should be shut o, threaded ttings and unions rechecked, water
relled and system restarted. If the problem persists, contact technical support.
Essentially, the Cascade will not have a prime cycle; however, the needs of the system will vary slightly based
on pipe type, diameter, suction lift height, horizontal distance, motor speed and horsepower. A check valve
and a priming pot are excellent tools to aid in the ease of operation of a Cascade pump.
For system specic assessments including suction lift and friction loss guidance and operating questions,
please call 503-356-5888 or email sales@performancepropumps.com.
PUMP OPERATION
The Basics
The Prime
With Valve
No Valve