Soaking according to this articles directions, and then hosing it off with the spray nozzle, is all you need to do.
chem geek said:one cup trisodium phosphate (TSP) to five gallons water or one cup dishwasher detergent to five gallons of water
chem geek said:using a good rinsing tool
ricksass said:
Agree. They are very ingenious and effective.
Many of us have over sized filters to reduce cleaning frequency so we are soaking 4 cartridges at a time.What are you guys using to soak your filters a 40 gallon bucket seems overkill for the relatively narrow filters. I’ve seen a few 22 gal commercial trash cans that are perfect size but for $100.
Without reading this full thread and stepping on toes, I see no reason to soak these in anything. I spray the solid matter off which restores flow and don't worry about the off color. It's already sanitized from chlorine right? Just don't see the point of getting them white again.