Wow, First I'd like to say great write-up and knowledge. You have helped me a great deal and I appreciate the time you spent to put it all down for us.
Second, I was hoping I can get your input/help on what I'm working on. Here is my pool specs
16X32, Approx 21,000 Gallons
Pentair Pinnacle 1HP pump, that is going out on me
Tagelius TA-50 Sand Filter
Polaris 380 w./Boost Pump
1.5" Pipe on Skimmer and 1.5" on main drain that goes to selector valve and 1.5" out of selector valve to pump and to filter
1.5" from filter that T's to feed booster pump
1.5" return lines that splits somewhere and goes to two return eyeballs
Only water feature is a fountain that is inplace of one of the return eyes
Since my pump is failing, I'm going to replace my pump and filter. I'm going to use the Pentair Quad DE and would like to use the wisperflow pump. I wanted a turn over rate of 4hrs, which I fiqured I needed to flow approx 90gmp. With the Quad 60 being a max 120gmp and ideal 90gpm, I fiqured that would be the one I needed. I have considered the Quad 80 at 160 max gpm but thought it may be to big and I may not be able to reach the ideal flow. Should I stick with the 60 or go to the 80?
Now the pump, with your tables I fiqured that I have a approx head of 45feet. With my 2-1.5" suction lines equalling a 2.1" line I'm fiquring I can reach my 90gpm goal. Also I was going to replace the line out of the selector valve to the pump and pump to filter with 2" line. The MPV i'm buying will be the 2". For the return I was going to use 2" and dig down at the pump pad and use a reducer to tap into the 1.5" line. My reason for this was trying to reduce the head and help the higher flow out, do you agree with this or should I just stick with the 1.5" return? As for the pump I was going to use a single speed because I didn't see the point of a two speed until I read all your info, so I'm now seriously considering the 2 speed. I was looking at the WhisperFlo WFDS-4 dual speed which will give me 100gpm @ 40ft of head or the WFE-24 single speed up rated which will give me 100gpm@ 40ft of head. I really want the dual speed because of what you said in your write-up but here's the problem I see with it: All of the 2 speed models have a max of approx 20feet of head on pentair's curve chart. Since I have approx 45feet of head, doesn't that mean that the pump will not move water on low speed? Am I missing something here?
Last question, should I use a flow meter on the new pump so I can figure out my turnover times?
I would really appreciate your, or anyones, help/guidance on this. I plan to hopefully buy on Tuesday 5 July.
Once again, awesome write-up and info. You have greatly increased my knowledge. Thank you