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GCAT

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  1. No, No, NO Thanks to all you guys, you are wonderfull sources of info and seem to know what you are talking about. I did not use a 1lb coffee can, I did use the scoope that comes in the DE bag. A single heaping scoope contains about 13 ounces of DE by weight,the actual scoop weighs 3 ounces empty. I installed 11 heaping scoops total. Do you still think its to much? It is a FNS plus vert grid, model 180009, FNSP60, salt water pool Frank
  2. UPDATE: PROBLEM SOLVED> The new Penatir filter grids arrived yesterday. I opened the box and it was the entire grid asbly already bolted together with a new manifold and base. I went home to drop them in. When I arrived the R pressure was 30PSI. I shut the sys down, bleed off the pressure, opened the filter housing and lifted out the old grid asbly. I grabbed the new grid asbly, lubed up the point where the pipe meets the manifold and lowerd the new asbly into the housing. Re-installed the top of the filter housing, installed the clamp and fired the pump back up. Bleed the air off the top of the filter and was looking at 17LBS of R pressure. I let it run for 10 minutes and it stayed at 17LBS. I then maxed suction to the skimmers and fed a solution of 11#(lbs)of DE and water slowly down the skimmer. I felt 6lbs of DE was just not enouge. I then throttled back the skimmers and blended in some bottom drain. After an hour of running and a full dose of DE the R pressure rose 2LBS to around 20Psi and is holding. NO doubt the grids had been pregnated. The cost of the complete Pentair grid asbly wound up to be 249.00. Lesson learned> running deficient amounts of DE damages the grids and when determining the proper DE amount its better to have a little more than less. Thanks for all of your input, everyone had great information thanks again
  3. I think I have damaged my grids by running isufficiently low amounts of DE. My back wash just does not clean the grids well enough anymore and R pressure creeps up in just a few days. I have ordered a new set of Pentair grids (249.00) and will install them this week. The filter specs state the DE amount is 6LBS,I will measure out 6LBS on a scale and make sure to always put the right amount back in. Obviously, during normal backwash the actual amount of DE added should be slightly less than 6LBS. I know, I know, I can clean the grids with acid but its a pain.
  4. The pressure is much lower during back wash. I think I have impregnated grids, they seem to hold water a little to long when I wash them down with the hose. I bouhgt a complete new Pentair grid set (249.00), should get them in a few days out of Dallas. 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). Mix the 6LBS of DE in a bucket with pool water and slowly pour into the skimmer. Then buy a case of CORONA light, drink one beer for every ten minutes the pressure stays where it should (20psi max). If all goes well that will be 24 beers in 4 hours, after that who cares about pool pressure. The article on DE filters was very helpfull, I will let you all know the results. Thanks Frank in Houston
  5. 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. If I take the filter apart after the BW rinse cycles the grids are still caked with debris. If I remove the grids, hose them off, reinstall them in order and reassemble the filter housing the R pressure comes down to 18psi. I have plenty of pump pressure, the valve appears to be switching fine. The pool stays clean, but again I cannot seem to get the grids clean during BW. Its a salt water, 40K gallon pool and I have just recently had this problom. 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. The disscharge flow out of the waste water pipe was great but like I said the waste water was clear as a bell. the R pressure droped to 20PSI but I have yet to add any DE. I usually add about 8 cups of DE after BW.I just checked and I am approaching 30PSI of R pressure again. I bet if I pull the filter apart I will find stopped up grids! Again, pool water stays crystal clear. The mainfolds in the filter look OK. Any ideas
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