If you’re struggling with murky pool water, I’ll save you some time: check your pool filter first. It traps loads of gunk, and without regular cleaning, it won’t do its job.
But cleaning a filter is simple. Just figure out the type of filter you have – cartridge, sand, or D.E. – grab a hose, and clean it using the method that works best for that filter type. Each one requires a slightly different approach, but they all lead to the same result: clean, clear pool water.
In this article, we’ll explain, step by step, how to clean each.
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What Type of Pool Filter Do You Have?
Before you put on your cleaning gloves, you need to know which type you’re working with because each type requires a slightly different cleaning method. There are three types of pool filters:
- Cartridge Filters: These use pleated paper or polyester that resembles large cylindrical air filters. They trap impurities as water passes through the pleats. They’re low-maintenance and make a great choice for pool owners looking to simplify their pool maintenance.
- Sand Filters: These sport a round, potbelly-shaped tank filled with special-grade filter sand. As water flows through, the sand traps debris and particles. Sand filters are easy to clean.
- Diatomaceous Earth (DE) Filters: These sleek, cylindrical filters use a fine powder made from fossilized diatoms. DE filters offer excellent filtration, but they require more involved maintenance.
Take a quick look at your filter system to identify which type you have – then follow the right steps below to clear out all the gunk it’s collected.
Cleaning a Cartridge Filter
What you need:
- Soft brush
- Cartridge cleaning solution (for deep cleaning)
- Garden hose with spray nozzle
- Protective gloves
- Screwdriver or wrench
- Turn Off the Pump Power
Turn off the pool pump and open the air relief valve to let out the built-up pressure inside the filter system.
- Remove the Cartridge
Unlock the latching mechanisms of your filter’s housing using a screwdriver and wrench. Then remove the cartridge and take note of its placement so you can reinstall it correctly.
- Clean the Cartridge
Rinse the cartridge with a garden hose, aiming between its pleats to dislodge dirt. If your cartridge has heavy grime, soak it in a mix of water and cartridge cleaner overnight and rinse thoroughly after.
- Reinstall the Cartridge
Check the cartridge for cracks, wear, or thinning fabric before placing it back in the housing. If all is good, reassemble and secure the cartridge. Switch the system back on the pump and check for leaks.
Cleaning a Pool Sand Filter
What you need:
- Backwash hose
- Sand filter cleaner
- Protective gloves
- Backwash the Filter
Start by turning off the pump and setting the multiport valve to “Backwash”. Attach a backwash hose if needed and turn the pump on. Let it run for 2 to 3 minutes or until you see the water clearing up.
- Rinse the Filter
Turn off the pump again and switch the valve to “Rinse” now. Let it run for 30 to 60 seconds to reset the sand bed.
- Apply Filter Cleaner (Optional)
If your filter needs a deeper clean, add sand filter cleaner in the recommended quantity and let it sit before repeating the backwash process.
- Set to Normal Mode
Set the valve back to “Filter” and turn the pump back on.
Cleaning a D.E. Pool Filter
Supplies Needed:
- Garden hose with spray nozzle
- Backwash hose
- DE filter cleaner (optional)
- A bucket for soaking grids
- Backwash the Filter
Turn off the pump and set the multiport valve to “Backwash”. Then attach the backwash hose and run the pump for about 3 minutes or until the water runs clear. Set the valve to “Rinse” and let it run for 30 to 60 seconds.
- Disassemble and Clean
Turn the pump off and open the filter tank. Remove the filter’s internal grids and spray them thoroughly with the garden hose. For the tough cases, consider an overnight soak in diluted muriatic acid followed by a proper rinse.
- Reassemble the Filter
Once the grids are clean, put them back into the tank and reassemble the filter. Follow the manufacturer’s instructions if you forgot the assembly.
- Add Fresh D.E. Powder
With the pump running, add the recommended amount of D.E. powder to your filter through the skimmer. Let the pump run for at least 30 minutes, letting the D.E. powder coat the grids evenly and restoring filtration efficiency.
FAQ About How to Clean a Pool Filter
You should clean your pool filter every 4 to 6 weeks, or sooner if the water turns cloudy or if the pressure gauge reads 8 to 10 PSI above normal. In addition to monthly cleanings, give your filter a yearly deep clean based on its type for peak performance.
Your pool filter is clogged if the water becomes cloudy or flow weakens, and the pressure gauge reading is 8 to 10 PSI above normal. Unusual noises also indicate a blockage.
You can use a diluted vinegar solution to dissolve deposits, but baking soda isn’t effective for cleaning mineral or oil buildups. For best results, stick to filter-specific cleaners and cleaning methods.
Need Help Cleaning?
I dislike the cleaning part and love the relaxing by the poolside part, and if you’re like me, you’d prefer someone to handle all the filter gunk for you.
No worries, Home Gnome connects you with experienced pool experts near you. So book yours today.
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Main Photo Credit: penyushkin / Adobe Stock
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