Hayward is a pool filter company that makes filters that are low maintenance. The filters are made with one of three different methods of filtration; sand, cartridge and diatomaceous earth (DE). Sand cartridges use sand to filter debris. Cartridge filters have a larger surface area for filtering on the inside of the filter, making them less prone to clogs. DE filters uses pressure to push water through fine grit made of fossils, which is backwashed like a sand filter. No matter the filtering method, there are common troubleshooting methods when the filter doesn't work.
Hold your hand in front of the return fitting, or partially close a valve coming from your pool pump if the filter is noisy. Excessive water pressure will cause a suction noise to come from the filter. Downsize the pump or upsize the backwash valve to solve this problem.
Test your pool water for the correct pH if the pool filter does not help keep the water clean. Use a testing strip twice a week to check that the chlorine is at the correct level to fight algae.
Backwash the filter if water is coming out dirty. Remove the screws from the filter using a screwdriver and make sure all the gaskets are in good shape, without cracking or wear. Clean or backwash the filter when the PSI from the unit is 8 to 10 points higher than the starting PSI.
Contact your Hayward dealer if algae is in the pool for the correct chemicals to remove the problem. Algae will clog the filter, requiring specific chemicals according to your filter model number and filtering style.