Split from vs-pump-calc-minimum-rpm-using-filter-psi-t40667.html Butterfly
I just installed an IntelliPro (not the IntelliFlo) pump for my 15,000 gallon pool in Florida, and I have the same questions as the original poster. I was hoping someone could look at my information and recommend pump speeds/times for my situation.
I have two, 2" suction lines that run through a spacesaver Jandy valve (set so both lines are fully open)and then into the pump. One line is for skimmer which is about 55' away. The other line is for the drain which is about 60'. The filter feeds into a 48 cubic foot Hayward DE filter (DE-4800) with a Selecta-Flo valve (SP-740-DE) with 2" piping. Unfortunately the pool builder downsized the piping out of the filter to 1 1/2" (which pisses me off) going into and out of a Hayward chlorinator. This is split with another spacesaver Jandy valve into two 1.5" return lines (only one of which is usually selected). One return line goes to the four nossels in the pool - the first of which is about 40' away. The second return line goes to a couple water feature fan-out sprayers than make an arched, fanned out sort of fountain back into the pool. I ususally leave those off so that the pressure is fully used to keep the water circulating, but maybe I should turn them on to increase the pump's flow rate?
I took some pressure readings last night. The pressure guage on the top of the pump is about 46" above the water level. Here is what I got:
750 rpm: the scale does not move so I will guess 1 psi
1000 rpm: 2 psi
1500 rpm: 3 psi
2000 rpm: 5-6 psi
2500 rpm: 10 psi
2600 rpm: 12 psi (I set this as the max rpm since the rep. told me this was equivalent to the old 1.5 hp pump I had)
I do not have any solar or other heater setup and I no longer use a suction pool cleaner.
The pool stores seem to recommend two turnovers per day, but other places say you only need one. I am thinking one in the winter is probably ok, but maybe 1.5 or 2 would be better the rest of the time (really we only have an 8 month summer and a sort of 4 month fall/spring here in Florida). If anyone has input on this I would appreciate it. I used to run my old 1.5 hp pump for 6 hours in the winter and 8 hours in the summer.
I am wondering if it is better to run the pump longer at a lower speed to keep the algae away, or if a low rate (like the 750 setting) is too low to circulate the water well enough. At the 750 setting barely any water comes out of the 3rd and 4th return points. Maybe, it is better to use two or three speeds? Of course, since I bought one of these expensive, multi-speed pumps, I want to use the most energy efficient rpm/time setting(s) to save on my energy bill - while keeping my pool properly filtered and circulated.
So, I wondering what flow rates I should be getting at a given rpm with my pool, and how I should configure the pump to run.
Sorry for the long post, but I wanted to give as much information as I could.