How to Clean A Pool Filter: A Comprehensive Guide

Worried why the pool water is still cloudy even though you clean it regularly? The reason could be a dirty pool filter that requires your attention.

Neglecting the pool filter maintenance can affect the water clarity, pool equipment, and the effectiveness of sanitizing chemicals, resulting in unhealthy pool water. Therefore, many home pool owners seek cost-effective solutions for cleaning their filters.

Whether you have a cartridge, sand, or DE filter, this guide shows how to clean pool filters step-by-step to save money on replacements.

Why Cleaning Pool Filters Matters

Cleaning pool filters can step up your swimming experience and reduce the risk of costly repairs. Suppose the filter is the “kidney” of your pool, removing harmful microorganisms and debris that can make the water unclear or unsafe.

What’s more, the unclean or clogged filters restrict the water flow and increase the pump strain. This not only damages the pool equipment but also incurs significant energy bills. 

On the other hand, a clean filter extends the pump's lifespan, reduces energy costs, prevents cloudiness, and minimizes the need for chemicals to maintain pool sanitation. You will get clean, sparkling water with balanced pressure levels at all times.

What is a Cartridge Pool Filter and How to Clean it 

Most owners with above-ground pools have a cartridge pool filter. It simply contains a polyester pleated material (polyester, paper, or cotton) that traps debris as water flows through it. As soon as the pressure gauge hits 10 PSI, clean the clogged cartridge immediately.

How to Clean a Cartridge Pool Filter

Follow these steps to remove the accumulated debris and oils from the cartridge. 

1. First, turn off the pump and release the pressure by opening the filter housing manually. 
2. Untighten the locking ring and lid to remove the cartridge from the tank with care. 
3. Rinse the cartridge with a spray nozzle at about 45 45-degree angle. 
4. After removing the trapped dirt, soak the filter in a mix of cleaner and water with a 1:10 ratio. Or, replace the filter if needed (typically every 18-24 months)
5. Let it soak for 12-24 hours, depending on the heavy grease or algae. Rinse it before reinstalling. 
6. Check for any wear and tear. Reinstall the cartridge with correct alignment. Reassemble the housing and close the air relief valve.
7. Restart the pump and check for leaks. 

Unlike sand filters, cartridge ones are easier to clean and don’t require backwashing. You can also use a filter cleaning wand and mild detergents. Worth noting: Don’t use flocculants or clarifiers with cartridge filters. Also, avoid high-pressure washers to prevent damage.

What is a Sand Pool Filter and How to Clean it 

Primarily, a sand filter is a sand tank connected to the filtration system. Whenever the water passes through it, the sand traps the debris, which then goes to the waste, resulting in clear water. The filter housing, made of stainless steel or fiberglass, is a durable choice that withstands high pressure.

How to Clean a Sand Filter

Cleaning a sand filter involves backwashing that removes smaller particles until the sand becomes denser. Here is what you need to do:

1. Turn off the pool pump. Set the valve to “Backwash.”
2. Start the backwashing sand filter either manually or automatically. Attach a backwash hose to reverse the flow of water away from the pool area.
3. Turn on the pump and backwash for a few minutes until the water appears clear.
4. Set the valve to “Rinse” to run for one minute so the sand is settled.
5. Now set the valve back to “Filter” mode. Run the pump and double-check for leaks.

Backwashing isn’t a laborious task, but overdoing it can damage the filter. Therefore, follow the user’s instructions on how much sand to add and always run the pump with water. Make sure to check for sand replacement (every 5-7 years) if clumps develop.

What is a DE Filter and How to Clean it

Diatomaceous Earth or DE filtration uses a porous powder and absorbs large amounts of water like a sponge. The DE powder traps the dirt by coating the filter grids, forming a cake-like layer. It is the most effective filtration type for removing the finest particles.

How to Clean a DE Filter

Cleaning DE filters can be more complex than other filter types. For effective filtration, follow these steps.

1. Turn the pump off. Set the valve to “Backwash” mode and attach a hose. Backwash it for 2-3 minutes until the water seems clear.
2. Switch the valve to “Rinse” mode for one minute to clear the remaining DE.
3. Open the filter housing and remove the grid to clean it. Remove the DE and debris with a hose washer.
4. Check the grids for any damage and replace if necessary.
5. Set the valve to “Filter” mode. Add the fresh DE to the filter.
6. Make a slurry by mixing DE powder with water. Slowly pour it into the skimmer with the pump running.

Handle the DE filter cleaning properly to prevent inhaling powder. And, follow the user’s instructions to add the right amount to avoid messy backwashing.

Comparison of Filter Types 

Let’s make the filtration guide easier by comparing the cost, cleaning frequency, pros, and cons of each filter. 

Filter Type	Cost	Cleaning Frequency	Pros	Cons
Cartridge	$100–$500	Every 3–6 months	Easy to clean, no backwashing, only soaking	Less effective for fine particles
Sand	$300–$800	Every 1–2 months	Low maintenance, durable material	Requires backwashing, sand replacement
DE	$500–$1,200	Monthly backwash	Superior filtration	Complex cleaning, DE disposal issues, Grids need replacement

Maintenance Tips and FAQs 

For pool owners, it is essential to maintain water, monitor pressure gauges, and clean the filters before winterizing. This will save money on purchasing sanitizing chemicals and replacing equipment often.

Another practical approach is to use a high-quality robotic pool cleaner, such as the Dreame Z1 Pro, to maintain clean pool surfaces at all times. This will save you a significant amount of time and hassle.

FAQs about Pool Filter Cleaning

Q: How often should I clean my pool filter?

A: Pool filters should be cleaned every 1-6 months, depending on the filter type, pool usage, water conditions, and pressure readings. 

Q: Can I use a pressure washer to clean my cartridge filter?

A: No, high-pressure washers can damage the filter media and cartridge pleats. 

Q: How much DE do I need for my filter?

A: It depends on the size of the filter and whether you are just cleaning or backwashing. You can add 1-5 lbs of DE for every 10 square feet. 

Conclusion 

Improve the quality of pool water by cleaning the filters regularly. Proper filtration reduces maintenance costs and prevents algae growth. The above guide shows how to clean filters and avoid damage regardless of the type. Consider investing in a robotic pool cleaner if you use your pool frequently to prevent debris accumulation.

Enjoy swimming in sparkling, clean water this season!