Quote Originally Posted by duraleigh
Hi, Mike/Scott,

When I built my pool, the consensus was to pump enough water to turn over your pool 2-3 times a day. (on high speed) (30,000 gal pool needs a pump to turn approx 75,000 gal in a 24 hour period......52 gal per minute.)

Then, choose a filter that is rated (in gpm) of at least 110% and maybe 130% of that 52 gpm....say, around 60-80gpm.

The trick will be in calculating total head of your pool so you can look up the curve of a particular pump and see if it satisfies your requirements.

I seem to remember an average pool has a total head of about 50 but I think there are others on this forum who have better info on that.

My pump and total head computed out to about 90gpm on the curve (1.5 full-rated) so I got a filter rated @ 140 gpm.

To summarize, compute how much water you need to turn, get an average idea of your total head, find a pump curve that matches that, get a bigger filter.......you're good to go.

Dave S.
I've kinda done that. The hard part is coming up with total dynamic head. SInce the pool exists, I cannot go out and figure out how many elbows and such are there. I don't have X-Ray vision. So, I went with the typical 40 to 50 feet of head. A 1 hp full rated or a 1.5 hp up-rated pump fits the bill, at least it does if I haven't screwed up something. Also, a 48 sq ft DE filter has about 1.5 times the needed flow rate, so I think thats the correct choice.

I'm looking at a Hayward Super II pump or a Pentair Whisper flow. The exact model depends on whats on Southern California Edison's rebate list.

I'm looking at a Pentair FNS plus or a hayward pro-grid.

I think I'll also put in a rainbow in-line or off-line clorinator (model 300 or 320).