Multiply this number by a standard multiplier, which is 7. 5 for rectangular and square pools and 5. 9 for other shapes. Example: 16325*7. 48 = 19,149. This would give the volume of the pool in gallons for this 16x32 inch pool that has an average depth of 5 feet. If your pool has different areas of depth to it, calculate the volume of each area of depth before adding them all together to find the total volume of your pool.
The pump manufacturer can tell you the flow rate for certain resistances. An average 1 HP pump will move about 50 gallons per minute. This would be 3,000 gallons per hour.
For example, using a pool volume of 19,149 gallons and a filtration rate of 3,000 gallons per hour: (Pool Volume ÷ Filtration rate) x 2 = Hours to run filter (19,149 ÷ 3000) x 2 = 12. 766, or about 12 hours and 45 minutes for a full 2 cycles.
If you’re experiencing temperatures of 80 °F (27 °C) or greater, you should be running your filter about 10-12 hours regardless. [4] X Research source
Although running your filter at night may save you energy, it does nothing to prevent the algae from forming during the day when it’s actually got a chance to, unlike at night.
This way, you’ll be ensuring you’re filtering out the entire contents of your pool at least 2 times a day. If you have a small filter, you will need to run the filter longer depending on how many gallons the filter can process in a given time. Don’t worry about running it for too long, it’s better to overrun your filter than not run for long enough.
Here are instructions detailing how to Clean a Cartridge Type Swimming Pool Filter.
