Pool Pump Questions

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Grassy_Nole

Member
Sep 11, 2021
12
Georgia
I have a 7500g salt pool. Current pump is a 1.25 HP SMF-110. Salt Cell is a Pentair-iChlor 30.

How many hours a day should I aim to run my current pump? I live in the south and pool gets hammered full sun.

Second, Im having a hard time wrapping the numbers around if it makes sense to possibly make a change to a VSP and ditch the single speed. For my pool size, what size VSP would I be aiming for? Any input here would be greatly appreciated as Im sure Im overthinking the numbers and run times of a VSP.
 
Grassy_Nole said:
How many hours a day should I aim to run my current pump?
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With a single speed pump, you probably want to minimize run time to save electricity. The iChlor 30 will generate 1 lb/day of chlorine. 7 hours of runtime with your SWCG at 90% will generate ~4 ppm FC, which is typical daily FC demand. Your FC demand will be higher in the peak of summer and less at other times of the year. You can see the estimated production in PoolMath --> "Effects of Adding" --> SWG.

Grassy_Nole said:
possibly make a change to a VSP and ditch the single speed
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VSP will save you a lot of money on electricity and give you flexibility. Many (including myself) operate 24/7 at slow speed. Costs me $5/month in electricity. I like the constant chlorination, skimming, filtering, and circulation.

Grassy_Nole said:
what size VSP would I be aiming for?
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Get a 2.7 or 3 hp pump. At slow speed, it will move water using less electricity.
 
pjt said:
With a single speed pump, you probably want to minimize run time to save electricity. The iChlor 30 will generate 1 lb/day of chlorine. 7 hours of runtime with your SWCG at 90% will generate ~4 ppm FC, which is typical daily FC demand. Your FC demand will be higher in the peak of summer and less at other times of the year. You can see the estimated production in PoolMath --> "Effects of Adding" --> SWG.


VSP will save you a lot of money on electricity and give you flexibility. Many (including myself) operate 24/7 at slow speed. Costs me $5/month in electricity. I like the constant chlorination, skimming, filtering, and circulation.


Get a 2.7 or 3 hp pump. At slow speed, it will move water using less electricity.
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Thanks for the helpful reply. That was the last piece. I see most recommending going 3HP VSP but my pool is very much on the smaller side of most here at 7500g. Im going to pull the trigger on the 3HP and run it slow.
 
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