In commercial pools, shocking may require being done two to four times 7 days to split swimmer waste, chloramines various other stuff. A lot of the necessary after large events with above average swimming use.

No challenege show up type of filter your pool utilizes - sand, cartridge or DE - be specific chemically clean the filter every 4 months with an honest filter clean. Backwashing of sand or DE filters and rinsing of cartridge filters only removes dirt and debris