How often should I clean my filter ?
Your pool filter plays one of the most important roles in keeping your water clean and healthy. Every day, it traps dirt, dust, leaves, insects and other fine particles that would otherwise remain suspended in the water.
Over time, all of this debris builds up inside the filter, reducing its ability to clean the water efficiently. Think of it like washing your hands in the same bucket of water over and over again. Eventually, the water becomes dirty and needs to be replaced. Your pool filter works in much the same way—it needs to be cleaned regularly to continue doing its job.
As a general guide:
Media (sand or glass) filters should be backwashed every 1–3 months for most residential pools.
Cartridge filters should be cleaned every 1–2 months, or sooner if the water flow noticeably decreases or the pressure gauge indicates the filter is becoming clogged.
How to backwash a media filter
If your pool has a sand or glass media filter, follow these steps:
Switch off the pump.
Turn the multiport valve to the Backwash position.
Switch the pump back on.
Continue backwashing until the water in the sight glass runs clear. If your filter doesn't have a sight glass, backwash for approximately one minute.
Switch the pump off.
Turn the valve to the Rinse position.
Switch the pump back on and rinse for 30 seconds.
Switch the pump off again.
Return the valve to the Filter position before restarting the system.
Important: Never turn the multiport valve while the pump is running, as this can damage the valve.
How to clean a cartridge filter
If your pool has a cartridge filter:
Switch off the pump.
Release any pressure from the filter using the air bleeder.
Open the filter housing and remove the cartridge.
Thoroughly hose the cartridge from top to bottom, working between the pleats to remove trapped debris.
Reinstall the cartridge.
Secure the lid and restart the pump.
If the cartridge remains dirty after hosing, or if water flow doesn't improve, it may require a chemical soak or replacement.
Alex’s Advice💡
A clean filter:
Improves water clarity.
Helps chlorine work more effectively.
Reduces the risk of algae growth.
Improves water circulation.
Reduces strain on your pool pump and other equipment.
A good indication that your filter needs cleaning is when you notice one or more of the following:
Reduced water flow from the return jets.
Less water flowing through the pump lid than usual.
The filter pressure gauge reading higher than its normal operating pressure.
Your pool staying cloudy for several days, even though the water chemistry is balanced.
If you're unsure whether your filter needs cleaning or would prefer to leave it to a professional, feel free to book a pool service. I'll inspect your filtration system, clean the filter if required, and make sure your equipment is operating at its best.