The golden rule for single cartridge filter cleaning is once a month. Remember to keep in mind that this rule does not apply to every swimming pool. EVERY POOL IS DIFFERENT. Your frequency of cleaning should depend on the size of your pool, the size of your cartridge filter, pool chemistry, your bather load and the amount of dirt on debris that falls in your pool. Many pools that have undersized filters may need to be cleaned more often, while pools with oversized filter might be able to wait 2-3 months between cleanings.
When you take your cartridge out many times you will be able to visually see the accumulation of dirt and oils on your filter media. This change in color is a good indication that it is time to wash down your cartridge. Another way to monitor your filter cartridge is by checking the pressure gauge. If the filter pressure increases by about 8-10 PSI or more above the normal operating pressure
Cleaning your filter cartridge is simple and easy. All you need is a hose and a high pressure nozzle.
First, turn off your pool pump. Then, depressurize your filter but opening the air-release valve. Once you have removed the cartridge put it safe place in a safe place to be cleaned. Take your hose and pressure nozzle and point it down at a 45º angle Use the water pressure to clean the pleats from top to bottom. Repeat this process as you make your way around the cartridge. The deeper you clean your pool filter cartridge, the longer it will last.
Make sure your air-relief valve is open to release any excess air in the system. Your can also use this valve as an indication that your pump system is fully primed once water starts spitting out.
If your filter has been exposed to a significant amount of dirt and oils, you can soak it overnight in a solution of 1/2 chlorine and 1/2 clean water. Use a five-gallon bucket or clean plastic trash can, and make sure the cartridges are completely submerged in the water and cleaner mixture.