daltana said:
Thanks all and thanks for the welcome. On my 1800 gallon Spa I clean the Hayward C2025 filter cartridge when pressure rises 10 PSI over clean. It has a pressure dial with green and red pointers spaced 10 PSI apart. Runs at 10 PSI clean and 20 PSI I clean the filters.
More interested in the pool filter though. CPT school said over cleaning is a waste of time and DE powder. It has 18 grids that measure 18" X 24" that give me a filter surface area of 108 sq/ft. I use about 12.5 pounds of DE per cleaning which at 1 cleaning/week is 50 pounds of DE per month. I am trying to reduce this and save myself time.
Thanks.
Well the standard answer of cleaning when pressure increases by 20-25% has already been given with the caveats for your situation.
Have you witnessed a cleaning yet? What do the grids look like before cleaning? Yes I have and the grids are in good condition.
After 1 weeks, do you notice water flow diminishing? Do you have a flow meter installed somewhere? Pressure guage on filters? No, water flow does not diminish. Flow meter installed on return to pool. no pressure gauge on filters as they are in a tank. Vacuum gauge before pump and pressure gauge after the pump.