Pump Efficiency, Head, Flow, and related technical info

[msm859]

Thanks for the explanation. It is an 18 x 36 pool with separate built in spa 6 jets, both have 400 sq" cartridge filters, 2 - intelliflo pumps, single 400 btu mastertemp heater, water feature with Pentair waterfall pump, still debating final finish.

[mas985]

You did not mention your plumbing. What does the pool builder want to put in and what do you want? Lines sizes, number lines, returns, skimmers, main drains, etc. Also, how far from pool to pad.

Your pool size is pretty close to mine and I have two skimmers, a split main drain and 4 returns.

Ideally, I would have each skimmer and the main drain pair on a separate 2" lines all the way back to the pad. 3, 2" lines are equilvalent to a single 3" line plus it will allow you to turn on just one of the three to isolate a suction line for repair or to drain the pool via the main drain only.

For the returns, you could go with one 2.5" line, two 2" lines or four 1.5" lines. Each configuration is equilvalent in terms of head loss. If the pad is close to the pool, you could go with 1, 2" or 2, 1.5" lines.

This should give you pretty close balance between suction and return. Adding ball valves at the pad to control flow will allow you to fine tune your flow rates.

[msm859]

I have two skimmers and the main drain with 3 - 2" lines going back to the pad which is @ 25' from the pool. There is a single 2.5" return line. Each line has a neverlube valve on it at the pad

There is no extra plumbing to divert the water to drain the pool via the main drain. Wouldn't there have to be a diversion valve to send the water somewhere other than back to the pool?

[mas985]

I have two skimmers and the main drain with 3 - 2" lines going back to the pad which is @ 25' from the pool. There is a single 2.5" return line. Each line has a neverlube valve on it at the pad

There is no extra plumbing to divert the water to drain the pool via the main drain. Wouldn't there have to be a diversion valve to send the water somewhere other than back to the pool?

Yes usually, a drain pipe is placed right after the pump with a manual valve so you can dump the water with either a hose or directly into a drain. You can also use flexible backwash hose to dump it on the lawn.

Also, it sounds like your plumbing is fine and will give you decent flow rates.