Determining correct size and type of pump

Pool pumps, pool filters and the plumbing of
swimming pools. Sand filters, cartridge filters,
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C6inFL
I'm new here
I'm new here
Posts: 2
Joined: Thu 03 Oct, 2019 15:32
My Pool: 14,000 gallon in-ground, solar heat, 1hp pump

Determining correct size and type of pump

Postby C6inFL » Thu 03 Oct, 2019 16:38

Pool was here when I purchased the home, has a 1hp (1.25 SF) single speed pump and cartridge filter. I can’t read anything on the filter housing but filter itself is Pentair Clean & Clear Predator 200 Sq Ft Filter

- 15,000 gallon (based on measurement calculations)
- 2” pipe
- 2” inlet & outlet on pump (no name on pump, century motor)
- Solar panels on roof
- Run cleaner on the skimmer suction side
- Drain in bottom, no fountains or water features

Pool Pump runs 8hrs a day and is at the end of life, rusting out and running very hot (will shut off). I was trying to calculate the THP, so I put a Vacuum and PSI gauge on pump to get some readings, here is what I got.

- 10 psi (10 x 2.31=23.1)
- 20 hg (20 x 1.13=22.6)
- 23.1 + 22.6 = 45.7 TDH

I’d like to save on electric if I can, was leaning toward variable speed pump but don’t want to spend $800 + on a pump so was looking at some of the lower cost VSP’s. The only one that I didn’t see anything negative on was a Harris, which comes in 1.5hp ($399) and 3.0hp ($499). Certainly on the fence on / question reliability and quality of these pumps, will it really work properly for my application, and save energy. Tried going to the local Pool supply place and got " this 3hp should do the trick" without asking me any questions.

Thanks,
FJ


Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 1326
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Determining correct size and type of pump

Postby Denniswiseman » Fri 04 Oct, 2019 04:45

If a 1hp pump works ok now, then a 1.5hp VSP would definately be ok. You could then reduce the speed to a more suitable flow.
The slower the flow, the better the filtration.
The higher speeds can be used for backwash
I have a .5hp pump which delivers 10.8 cubic metres per hour
Your 15000 US gallons equates to 12500 UK gallons so 25% larger than mine
The 1.5 should be well within the size and if you can get it to run at about just over .5 hp
C6inFL
I'm new here
I'm new here
Posts: 2
Joined: Thu 03 Oct, 2019 15:32
My Pool: 14,000 gallon in-ground, solar heat, 1hp pump

Re: Determining correct size and type of pump

Postby C6inFL » Fri 04 Oct, 2019 08:14

Thanks Dennis for the quick reply.

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