Just as you need to restore and balance your pool chemicals to keep the water clean, clear and sanitary, so too do you need to replace your pool filter cartridges when they start to lose their efficiency. The pool filter system, together with the pump, helps trap debris and remove it from circulation of the pool’s water, working with the pump and chemicals to keep the pool clean. How often you need to clean or replace your pool filter cartridge depends on your local conditions, but it’s important to recognize the signs of a filter that needs attention. If you’re starting to see the need to clean your pool more frequently, if the water clarity is suffering, or you’re seeing decreased water flow and increased pressure readings, these are all signs you need to clean or replace your filter cartridge. Shop replacement cartridges here from Pentair, Hayward and Hurricane.