Hey everyone first post here. I have an intex 22x52 that I am going to re do this spring and make it a more semi permanent set up. I just acquired a used dynamo 340197 1 hp pump. I am trying to match a sand filter to it but don't know the flow rating of the pump. I have tried searching online and cannot find anything. Any way to calculate it or any input on what size sand filter is needed? Thanks for any help
How to figure out flow rate of pool pump?
- Thread starter aaronpapemh
- Start date
- Jan 4, 2016
- 5,392
- Pool Size
- 44000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
Welcome to TFP! Good to have you here 
It depends on a lot things like pipe size and length and so on, but probably around 40 to 50 GPM, possibly as much as 60 GPM if plumbed in large pipe close to the pool and no heater.
A 21" would technically be enough, but a 24" would be a better choice. Generally speaking, the biggest filter you can afford does the best job and requires the least maintenance. I've never heard anyone say they bought too big a filter.
It depends on a lot things like pipe size and length and so on, but probably around 40 to 50 GPM, possibly as much as 60 GPM if plumbed in large pipe close to the pool and no heater.
A 21" would technically be enough, but a 24" would be a better choice. Generally speaking, the biggest filter you can afford does the best job and requires the least maintenance. I've never heard anyone say they bought too big a filter.
cfherrman
TFP Guide
You can search for a head chart for your pump, then match it to a sand filter. With that size of pool a 19" or 21" is probably the size you need. Your pump will be slightly oversized for the pool but that's ok.
With the pump being over sized for the pool do you think I could get away with a shorter run cycle then the standard 8 hours?
- May 3, 2007
- 18,052
- Pool Size
- 20000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
Yes! There is really no magic number for run time or turnovers. Bit of a myth created by the industry. The short answer is you can run the pump for as short as you want as long as enough chlorine is getting into the pool and is distributed. But chlorine distribution takes very little time for most pools (< 30min). The limiting factor in run time is usually other factors such as skimming and floor cleaners.
Pool School - Determine Pump Run Time
Pool School - Determine Pump Run Time
FWIW -
The “turnover myth” was first penned to provide public facility operators of minimum competence & training a baseline & prevent facilities from “subjective” run times in order to trim operating cost.
The “myth” has trickled into residential operating manuals.
The “turnover myth” was first penned to provide public facility operators of minimum competence & training a baseline & prevent facilities from “subjective” run times in order to trim operating cost.
The “myth” has trickled into residential operating manuals.
cfherrman
TFP Guide
I had my pool at 10000 gallons, which is probably close or more than yours, I ran 6-8 hours a day, at $0.10 a kw and 1/2 hp it was cheap.