Pentair 3-way Diverter Operation

by Gareth
(Boca Raton, FL)

3-way Diverter

3-way Diverter

Wonder if someone could give me some information.

I had a Pentair 3-way diverter installed on my pool filter set-up while I was away at work today, but the installer failed to leave instructions on how to operate it.

One port is the main drain intake, other port is the skimmer intake, and the other port is the inlet to the filter basket and filter (Hayward cartridge).

My question is, at what position should the handle be top allow free flow of BOTH inlet ports.

Any help, or direction would be appreciated.

Thanks for the question Gareth

The positions of the valve depends on the kind of pool you have and how much dirt/debris there's going to be in the pool. You're going to have proper water flow, between 40 - 60 gallons per minutes (GPM) all things being equal, without turning off one side of the valve, and the pump motor and filter are working properly.

What I mean by that is this...

If you have lots of debris in the pool as in leaves, grass clippings, flower pedals, etc... you're going to want to have more suction at the skimmer and less at the main drain. Conversely, if you have alot of dirt and windstorms, then you'll want the bottom drain to be open just a bit more.

But then, if your backyard is relatively clear of debris, then you can balance the valve out with suction from all three sides.

When the handle is parallel, or going in the same direction with the piping, that area will be closed off.

You can rotate the handle to the desired “OFF” position. The diverter valve handle OFF indicator, represents the current position of the
valve’s internal diverter seal which will stop the flow of water.

If you look at the picture I enclosed, you'll see the valve. If you turn the handle straight up and down, with the fan "OFF' position down, this will allow water to free flow and balance out. You can turn the handle to decrease water flow to a certain area, thus increasing the flow to the other areas.

Get some Duct tape or masking tape and write on it which one is to the skimmer, drain, and filter, and tape it to the corresponding pipe. You can then adjust the flow according to your need.

Again, it depends on your pool's individual needs as to the positions. There's really no right or wrong answer. You can play with it and get is dialed in for your pool.

Hope this helps and have a great Summer.


Click here to read or post comments

Return to Swimming Pool Problems-1.

How To "Run" In Ground Spa Attached To Pool

by John

I have an inground pool that has a spa that acts like a fountain during the day when the pool is running its normal day cycle. The spa sits at an elevation thats about 2 feet above the pools waterline and has a cut edge where the water from the spa pours into the pool for the "waterfall".

When the pool pumps normal cycle is done after the day (6 hours), within 30 minutes, the spas water level gradually levels down to match the level of the pool where the spa water line is just an few inches above the spa's jets.

The person I bought the house from said the pool is not heated, but there is a heater, pump, and blower for the spa and that I can never run the spa during the normal pool operation during the day. When I turn on the spa heater and pump after the normal pool cycle, I can verify that the spa is working but the water lever of the spa is so close to the jet nozzles that the operation dosnt look right to me.

Can anyone chime in on what I'm missing/doing wrong?

ADDL INFO: The pool has it's own pump & timer, and the spa has it's own pump, heater, timer as well as a blower. There are four valve knobs located at the pool equipment site labeled "Water Feature", "Pool Return", "Main Drain" and "Skimmer".

Thanks for the question John

The water level of the spa should stay up to the tiles, or 1/2 way up the simmer (if you have one) and shouldn't be losing any water. From the question it's obvious you know that. What I'm getting from the question is that your spa is losing water and that water is returning back into the pool.

There's a couple of things you can check. First is the check valve. This is a one way valve that's installed in the spa return line to keep the water in the spa and returning back into the pool when the filter pump shuts off. Check valves usually have an o-ring inside that can deteriorate.

Make sure your valve actuators are sync'd up correctly. Actuators are mechanical devices that use gears to engage valves. You might have a broken valve shaft. The actuator still rotates but the valve diverter doesn't.

Before tearing anything apart, check to see if there's a leak on the outside somewhere, around the spa. Any repairs that are in-line might be for a professional pool tech or repairman.

Inspect the check valve(s), actuator, and any leaks around the spa.

Hope this helps and let me know how it turns out for your.


Click here to post comments

Return to Swimming Pool Problems-1.

Pool pump size

by Richard

I've tried searching online but no matter how i word the question i don't get the answer i need.i have an agp 15' x 48".i'm using a 1500 gph pump and separate saltwater system.will a side wall skimmer work with this size pump or do i need to go with a larger doesn't list hp in the manual,just 1500 gph?

Hi Richard. According to the specs you have given, you have a pool has about 5k gallons. For that size you would only need a 1 HP pump. 1.5 HP would be too powerful. According to most specs and manufacturers, the set-up filters about 1k gallon per hour, or about 18 gallons per minute. It would only take approx. 5 hours to filter all of the water. And that's the goal. Most inground systems take 8 - 10 hours to do the same.

Over-size filters are alright, and many times recommended. But a too large pump motor will force the water through the filter too quickly, decreasing the filtration properties and possibly damaging the filter.

At 1500 GPH, or in other words, 25 GPM, I'd say the size pump motor is fine for your pool's needs.

Hope that helps and have a great Summer.


Click here to post comments

Return to Swimming Pool Problems-1.