When purchasing a new in-ground swimming pool, you need to determine what size pool pump is required. There is a tendency to purchase a bigger pump than what is necessary because people think bigger is better. However, not only does this lead to higher operating costs, but you may also be overpowering your filter system. As a general rule, you should have a pump that filters all the water in a pool in an eight-hour period. This page will show you how to select a pump that filters all the water in your pool in eight hours.
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InyoPools Product Specialist Matt S. Posted: 1/13/2021
That is essentially a small lake, that would require a commercial-style pump and filtering system. That is not something we can size with that basic of info. If this is a new install we would need to know an accurate feet of head, plumbing size, any local codes that may affect the type of pump install. If you are replacing a pump, you can go with the same model and HP if you have that information.Reply
Chris Posted: 9/14/2020
My in ground pool has 2" inlet and outlet supply lines and a 2 1/2 hp pump. Can I use a sand filter with a 1 1/2" multiport valve?Reply
InyoPools Product Specialist Matt S. Posted: 10/22/2020
I would not match a 2.5 horsepower pump with a 1.5" port multiport valve; guaranteed pressure issues.Reply
Chris Posted: 10/22/2020
Thanks, I had the contractor replace the 1 1/2" valve with a 2" multi-valve. Much quieter, less vibration and better performance.Reply
lee r. swidler Posted: 7/31/2020
our 10,000 gal pool translates to 21GPM I believe. for a solar set up running 8 hours a day (min), what size pump would be good? are there kits which include panels?Reply
InyoPools Product Specialist Matt S. Posted: 9/1/2020
The Pentair IntelliFlo VF Variable Speed Pump - 011012 would be the ideal pump for your install. Because that is a very specific and relatively l low flowrate, a variable speed would be a must. The VF has an advantage over all the other variable speed pumps because it allows you to set your motor's speed based on desired gallons per minute instead of RPMs.Reply
Jessica Posted: 6/28/2020
I’m desperate. My pool isn’t suctioning. Rectangle 36 x 16 (or so). I know it’s 30,000 gallons. What kind of pump do I need?Reply
InyoPools Product Specialist Matt S. Posted: 9/23/2020
How do you know this is an issue with the pool pump and not an issue with your system? How to Correct Low Water Pressure in Your Pool SystemReply
Jessica Posted: 6/28/2020
I’m desperate. My pool isn’t suctioning. Rectangle 36 x 16 (or so). I know it’s 30,000 gallons. What kind of pump do I need?Reply
InyoPools Product Specialist Matt S. Posted: 8/26/2020
Has the pump always struggled with low flow, or is this recent issue? If it is a recent occurrence, I will try troubleshooting the pump and plumbing using this guide - How to Correct Low Water Pressure in Your Pool System. It is a heck of a lot cheaper than a whole new pump.If this flow issue has been constant, I can try to find a suitable upgrade if you can provide me the model number of your pump.Reply
Anonymous Posted: 5/12/2020
I have a 35,000 inground pool what size sand filter and pump do I need?Reply
InyoPools Product Specialist Matt S. Posted: 11/10/2020
For a 35k gallon pool, I suggest using the Pentair IntelliFlo VF Variable Speed Pump - 011012 and the Pentair Filter - TA-100D (30-1/2") Tagelus W/ Valve - 145240Reply
Tom G Posted: 4/5/2020
Hi, I would like some help please with sizing pump and filter? I have a pool that is 5o ft x 26 ft and between 4 ft x 6 ft deep, I wanted to know my flow rate. I figures 93 GPM also there is 2 1/2 piping a 3 hp pump and a Hayward filter W3C4030 {425 sq ft } and 3 heater in parallel would like to know if the pump is too big or keep pump and increase filter. at present motor and pump are new but current draw in high. it may be causing drag through the filter. thank youReply
InyoPools Product Specialist Matt S. Posted: 4/7/2020
Is this a commercial or residential installation?Reply
Thomas Gallagher Posted: 4/7/2020
It is condo association.Reply
InyoPools Product Specialist Matt S. Posted: 4/7/2020
That would probably fall under commercial, which has different local ordinances and codes that vary depending on the area. You'd do best to contact a local contractor or inspector to have them guide you.Reply
Anonymous Posted: 3/30/2020
I have a 20x40 unground pool with a 10ft deep end 30,000 gallons of water. I have a 1 1/2 hp motor but I just got a lager filter and my water flow has greatly decreased. Should I get a 2 or 2 1/2hp?Reply
InyoPools Product Specialist Matt S. Posted: 3/31/2020
The addition of the filter shouldn't have changed the flowrate of the system. it may have affected the PSI reading on your filter, but flow shouldn't be an issue. PSI does not necessarily equal the flow rate. The larger filter allows the water to sift through quicker, keeping PSI lower but the flowrate should stay unaffected; if not increase Take a look at this article: How Do I Correct Low Water Pressure?; for an idea of why you may have lower flow.Reply
Buster Posted: 12/13/2019
Great article. Too bad there are so many lazy people who don't even take the time to use the formulas. "I have a 10,000 gallon round pool. I"m too dense to figure out my pump size. DUUUUUUUUH"Reply
Mary Posted: 12/6/2019
We have a kidney shape in-ground fiberglass pool 10000 gallons. Pump Waterway smf-110 just blew. What pump should we purchase for replacement?Reply
InyoPools Product Specialist Matt S. Posted: 12/9/2019
You may install another Waterway SMF 1 HP Max Rate Single Speed Pump or you can use a different model like the Pureline Prime 1HP or Prime 1.65 VSReply
Anwar Posted: 8/28/2019
I just have a 13 x 8 round above ground pool please what size pumpReply
InyoPools Product Specialist Robert M. Posted: 9/4/2019
A 1/2 or 3/4 HP pump would be sufficient for your pool.Reply
DavidB Posted: 9/9/2019
You stated 13 x 8 round. I assume you are saying 13' diameter? Or is this an oval 13x8?Reply
Anonymous Posted: 8/13/2019
What size pump should I use for my 24ft round pool?Reply
InyoPools Product Specialist Matt S. Posted: 8/13/2019
Because you have an above ground pool, this guide would be more helpful: How To Select Above Ground Pool PumpsFor a 24 ft round pool, a 1 or 1.5 horsepower pump would be sufficient.Reply
Anonymous Posted: 7/28/2019
Pool is 50.000 gallons. Has a Pentair 60 filter. In a pool house. No need for quiet. Need a new pump. Also have a heater, propane. Short run to deep end.Reply
InyoPools Product Specialist Matt S. Posted: 7/30/2019
Your post is missing information we mention in the guide required to determine the right pump, but generally the IntelliFlo Variable Speed Pump - 011018 would work for a residential installation.Reply
Gregory Posted: 7/15/2019
I want to buy a pump to use as a waste out pump to clean dead algae from the bottom of my gunite pool rather than using my filtration system. I want to use a above ground pool pump that I can plug in. Is 1 HP enough?Reply
InyoPools Product Specialist Matt S. Posted: 7/15/2019
I would just buy a sump pump, since that's what it is meant to do instead of trying to repurpose a pool pump.Reply
Liz Posted: 7/12/2019
I just have a 20 x 48 round above ground pool please what size pumpReply
InyoPools Product Specialist Matt S. Posted: 7/16/2019
For a pool that size, you would need at least a 1 horsepower pump. This guide goes into more details about sizing speciically for above ground pools: How To Size an Above Ground Pool Pump and Filter SystemReply
Carol Posted: 7/4/2019
Trying to decide between PureLine 1.65 or 2.7 hp variable speed pumps. 25000 gal, rectangular, waterfall, spa on separate 2hp pentair pump, pentair filter 520 gpm. Equipment 60-65 feet from drain. Going to add UV sanitizer. Appreciate the help.Reply
InyoPools Product Specialist Matt S. Posted: 7/9/2019
I would go with the 2.7 HP variable speed to have the extra filtering rate just in case.Reply
Above ground pool pump size Posted: 6/27/2019
Hi , what pump would you recommend for my rectangle 23 x 13 with a 4 ft depth pool please? Many thanksReply
InyoPools Product Specialist Matt S. Posted: 7/3/2019
I would need more of the criteria we mention in the article to make an adequate guess.Reply
Doug Posted: 6/15/2019
I have a 12,000 gallon kidney shaped in ground. I calculated GPM as 25. I don’t know the head rate. I want to update my pump which is currently a Sta-Rite Model MPRA6D-146L with a 3/4 HP SQ1072 Motor (which stopped working). The filter is Sta-Rite Model T-240BP-1. What pump would be a good replacement for energy efficiency and power? Should I stay with 3/4 HP? Thanks!Reply
InyoPools Product Specialist Matt S. Posted: 6/20/2019
You can stay with the 3/4 HP or you can upgrade to a variable speed which will provide maximal utility savings. The PureLine Prime Variable Speed Pool Pump 1.65 HP can be throttled to match your desired flow rate for any need.Reply
Scotty Posted: 6/5/2019
I have an above ground pool that is 53”x30’ what size filter and pump would you recommend?Reply
InyoPools Product Specialist Matt S. Posted: 6/6/2019
Great question; the answer can be found here: How To Size an Above Ground Pool Pump and Filter SystemReply