If you buy a 25# bag of DE, half a bag is good for a 60 sq. filter, use a one pound coffee can (or equivalent measure) and add 12 cans slowly into the skimmer. DE is measured by volume, not by weight, so a scale won't help. Usually your bag of DE will have a chart for proper amount of DE. Grids aren't normally "ruined" unless they have holes or tears in the fabric. Acid isn't nice to the fabric and should only be used as a last resort. After disassembling the filter and grid assy, use a good detergent/degreaser and a stiff plastic bristle brush to clean the dirt and oils off the grids. I posted this under the other topic as well.ĭon't clean the grids with acid. The article on DE filters was very helpfull, I will let you all know the results. If all goes well that will be 24 beers in 4 hours, after that who cares about pool pressure. Then buy aĬase of CORONA light, drink one beer for every ten minutes the pressure stays where it should (20psi max). Mix the 6LBS of DE in a bucket with pool water and slowly pour into the skimmer. I will install the new set, fire the system back up,then measure out the exact amount of DE on a SCALE(6LBS as per the tag on the filter housing). I bouhgt a complete new Pentair grid set (249.00), should get them in a few days out of Dallas. I think I have impregnated grids, they seem to hold water a little to long when I wash them down with the hose. The pressure is much lower during back wash. Do you think this is what could have happened? I can only guess from here, not seeing your filter first hand. Then with the grids blocked, you can't backwash well enough to get the D.E. Depending on the size (square foot) of your filter, it may not be enough. This could have happened if you are putting in 8 actual cups (measuring) of D.E. Your grids may be impregnated, and need to be chemically cleaned. What kind of pressure are you getting while backwashing? It should be significantly lower than your normal "dirty" pressure. If your not getting any dirty water thru your sight glass, the filter isn't backwashing properly. Any ideasĬheck out this thread for a general overview and some tips and tricks pertaining to cleaning/maintaining a DE filter. I bet if I pull the filter apart I will find stopped up grids! Again, pool water stays crystal clear. I usually add about 8 cups of DE after BW.I just checked and I am approaching 30PSI of R pressure again. the R pressure droped to 20PSI but I have yet to add any DE. The disscharge flow out of the waste water pipe was great but like I said the waste water was clear as a bell. Yesterday I was looking at 30psi of R pressure so I BW for 3 mins, rinsed for 90 seconds and repeated 3 times but I never saw any dirty disscharge through the transparent waste water tube. Its a salt water, 40K gallon pool and I have just recently had this problom. The pool stays clean, but again I cannot seem to get the grids clean during BW. I have plenty of pump pressure, the valve appears to be switching fine. If I remove the grids, hose them off, reinstall them in order and reassemble the filter housing the R pressure comes down to 18psi. If I take the filter apart after the BW rinse cycles the grids are still caked with debris. Can the grids go bad on a 4 year old Pentair DE filter? They do not clean up during a normal BW,rinse,BW,rinse,BW,rinse cycle.
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