Your Swimming Pool DE filter has short cycles when vacuuming

This is normal if the pool contains very dirty water. Backwash or regenerate and recharge more often. If there is a presence of live algae, add enough chlorine sanitizer to control this growth, then vacuum. The presence of alum or floccing agents will clog the filter. Vacuum so as to bypass the filter. Do not use floccing agents with DE filters.
▪ See Replacement Grids
S.Merillat®