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Its the flow rate of the pump, and of course filter has to be rated at least as high as the pump's flow rate
40,000gal pool should have a pump/filter rated at 60-80gal a minute, which would usually use a 2"(73gpm) to 2.5"(120gpm) pipe size
Pump inlet/outlet pipe size must be the same as filter inlet/outlet pipe size
1HP is fine
General speaking you want all the water in the pool to run thru the filter every 8 to 10 hours
40,000gal / 10hours = 4,000gal per hour
4,000gal / 60min = 67gal per minute as minimum flow rate
8 hour full exchange would need 83gpm flow rate
If there are any restrictions, that will cause pressure to build up at the pump impeller/blades and that causes cavitation(air bubbles to form in the pump)
Think of a boat propeller pushing the boat thru the water, when you accelerate the motor to push the boat faster cavitation starts, forming air bubbles behind the boat, but once at speed cavitation should stop unless prop is under size for the boat, lol, the high pressure behind the prop, forcing the boat forward, is gone
40,000gal pool should have a pump/filter rated at 60-80gal a minute, which would usually use a 2"(73gpm) to 2.5"(120gpm) pipe size
Pump inlet/outlet pipe size must be the same as filter inlet/outlet pipe size
1HP is fine
General speaking you want all the water in the pool to run thru the filter every 8 to 10 hours
40,000gal / 10hours = 4,000gal per hour
4,000gal / 60min = 67gal per minute as minimum flow rate
8 hour full exchange would need 83gpm flow rate
If there are any restrictions, that will cause pressure to build up at the pump impeller/blades and that causes cavitation(air bubbles to form in the pump)
Think of a boat propeller pushing the boat thru the water, when you accelerate the motor to push the boat faster cavitation starts, forming air bubbles behind the boat, but once at speed cavitation should stop unless prop is under size for the boat, lol, the high pressure behind the prop, forcing the boat forward, is gone
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