I have an IntelliFlo VF and Quad DE 100 filter on my 32K gal pool. Definitly oversized for my pool... but was hoping to go longer between backwash. Right after plastered and filled I was running it on highest speed and saw the pressure on filter go up and time to backwash... but now that I have it on regular cycle, 50 gpm, the pressure never seems to go up. For a variable speed pump, what is the proper flow rate to assess filter pressure drop? Do I need to run the pump on a short cycle at higher rate to properly evaluate filter backwash time? On average, how often should I need to backwash? 1 week? 2 weeks, etc? Also, aside from backwash, how often should I have to actually take the filter apart and clean the 4 cartridges inside?