newtopools
06-16-2006, 08:46 AM
How long should I run my pump for a 33' round ag pool at 1/2 hp on a 26" filter.Thanks, Sharon
mas985
06-16-2006, 11:24 AM
Most pools require 1 to 2 turnovers per day. What is turnover?
Turnover is the time it takes for the volume of the pool to run through the pump once. However, this does not mean that all of the water has gone through the pump. Some water goes through once, some twice and some not at all. To determine turnover rate:
First, determine the head loss for your plumbing. It is usually between 45-65 feet of head. If you want a better estimate, you can use this set of formulas:
Total Head = Suction Head + Return Head
Suction Head = Pump Suction (in. mg.) * 1.13 (or 10' if you do not have a vacuum guage)
Return Head = Filter PSI * 2.31
Second, look up the the flow rate from the pump head curve that is usually in the pump manual. The vertical axis is head loss and the horizontal axis is GPM.
Third, turnover (hrs) = Pool Volume (gallons) / (gpm * 60)
It is usually a good idea to split the filtering time into two parts evenly distributed within a 24 hr period.
My turnover is about 4 hours and I have solar so I run my pump 4-6 hours during the hottest part of the day to take advantage of the sun and skip the night cycle.
matt4x4
06-16-2006, 11:40 AM
On hot summer days, I run mine for about 10 hours, not so much for turnover as for getting all teh solar heat I can handle, I have a 30 foot dia. and a 1hp pump, supposedly it turns over in 4-6 hours.
Sometimes i don't run it at all for a day or 2.