I have been using fiberclear for the past few years in my pentair quad de 100 filter and have been very happy with it. I have gone as long as 8 months before cleaning the filter and I am using it like a cartridge filter so it doesn't have backwash set up. A few months ago I noticed that my flow was greatly reduced roughly 2 months after cleaning the filter. I cleaned the filter and recharged with fiberclear like usual and again after 50 days my filter pressure is up 10 psi and flow is greatly reduced. I'm not sure what could be causing this as it didn't happen the first few years using fiberclear. The only change I made was using a poolrx in my pump basket since spring. Does anyone think that could cause the filter to clog up in 50 days? I should mention that when I cleaned the cartridges i did not use any cleaning solution on them, just hosed them off with water. They looked ok after so I wouldn't think that would be causing this issue. Next time I clean them I have some spray on cartridge cleaner I'm going to use. Other than that I figure it must be something to do with the poolrx since i never had this issue before. Any thoughts?