16" or 19"?

mas985

TFP Expert
LifeTime Supporter
May 3, 2007
13,859
Pleasanton, CA
Pool Size
20000
Surface
Plaster
Chlorine
Salt Water Generator
The filter can be too small for the pump and cause problems for the filter. On the larger size, cartridge and DE have really no limit while for sand filters, manufactures usually specify 15 GPM/sq-ft for backwashing. However, I have my doubts that is really required as long as the backwash flow rate is higher than the filter rate which in most cases usually is.
 
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