What size pump and filter do you need for a 40000 gallon in ground swimming pool?

Answer 1

For home use one that turns the water at least once a day, the longer the pump can be running to equal this the better as moving water keeps it clean and mixed. Thus in this case the smaller the pump the better.

8000 divided by 24 hours divided by 60 minutes = 5.6 gallons a minute.

However for vacuuming etc you probably need a considerably higher speed and if using a salt water pool your chlorine generator may require a flow greater than this.

Thus a 2 speed or variable speed pump would be nice and much more cost effective as the pump will use much less energy running at low speed due to low pressure. Also pump will be much quieter.

The ultimate is a programmable Pentair IntelliFlo 3.2 KW - Swimming Pool Pump as it uses a variable speed high efficiency design with permanent magnets in the motor. I recently installed one in a 20,000 gallon pool and at 15 gallons minute it uses a bit over 100 watts. I boosted it to 20 gpm to better match chlorine generator and its at 150 watts, yet I can vacuum at a much higher rate as well as backflush, even at 98 gallons per minute backwash its quiet, mind you its piped with 2" pipe.

Also if you want to run at a high rate for fountains or Jacussi massage the capability is there with 2 override buttons settable for different speeds/times plus manual mode if desired.

Do a calculation based on energy costs to see payback as a pump will hopefully last several years.

ie. at 25 cents kilowatt hour (1000 watts hour), remember electricity costs are going up not down.

A: Possibly the above ans. got carried away. This is only an 8K amount not 80k and it is not going to have 2" or even 1.5" PVC pipe. It will have 1.25" plastic hose most likely. Probably the hp will be in .75 hp or less. And this also depends upon the filter capacity and flow rate. Best bet is go to a pool store and pick their brains for a satisfactory match up or equipment and pool capacity water wise and bather wise.

Answer 2

You could get by with a 1.5 HP pump with a high service factor of 1.2 or higher and a 24" sand filter if you are trying to save money. If you wanted to put on what would work best for your gallonage I would go with a 2.0 HP (full service factor again) and a 30" sand filter. Personally I would use a DE filter but you should research those before making your decision. B.T.W. that kind of flow will require 2" Plumbing, NOT 1.5". The 2 Horse will definitely require 2" or you risk cavitating the water in the pipes, the 1.5 Horse is a gamble.

Answer 3

i also use a 5000 gallon pool above ground and i use a 1 1/2hp pump. with a sand filter.

Answer 4

1 HP is fine.

Answer 5

3 quarter horse

Answer 6

A 3/4 hp pump would be about right.