If you have an in-floor system, consult with your pool builder to determine whether or not
you’ll need the flowreversal valves. Some systems will benefit from it while others won’t.
The thick arrows in illustration 3 indicate the direction the pop ups will sweep the
particulate matter which is towards the main drain. The narrower arrows show a more extensive
water flow pattern created from several openings in the floor of the pool.
Owners of aboveground pools do not need the flowreversal valve. They can plumb the
pool so that the water rises and is drawn off of the top. This can be an important consideration
since cost is a sensitive issue with most aboveground pools. Aboveground pool owners should
not attempt to install “single” valves to create a flowreversal environment. It is estimated that
between 6-8 gate valves would be required to duplicate the action of the single flowreversal valve.
This would result in a higher cost and would be extremely confusing to use.
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