DIY Pool Filter Cleaner - Homemade Solutions That Work

When a Homemade Solution Makes Sense

Commercial pool filter cleaners work well, but you do not always need them. A solid homemade cleaner handles the same job at a fraction of the cost when:

• You already have the ingredients on hand
• The filter needs a routine seasonal clean rather than a product-specific treatment
• You want to avoid shipping delays mid-season

The key is matching the right solution to the right problem. Pool filter contamination falls into two categories:

• Organic waste - body oils, sunscreen, algae, and debris. Requires an alkaline cleaner.
• Mineral scale - calcium deposits, hard water buildup. Requires an acidic cleaner.

Most routine cleaning only requires an alkaline soak. Acid cleaning is reserved for visible white scale buildup.

DIY Cleaners for Cartridge Filters

Cartridge filters collect oil, debris, and minerals on their pleated surfaces. A hose rinse dislodges loose particles, but the pleats need a chemical soak to release embedded oils and scale.

Option 1 - TSP Solution (Best for Heavy Buildup)

TSP (trisodium phosphate) is a strong degreaser available at hardware stores. It is the most effective homemade option for cartridges that are heavily loaded with oil and organic waste.

Recipe:

• 1 cup of TSP granules
• 5 gallons of hot water
• Mix until fully dissolved

Procedure:

1. Hose off loose debris from the cartridge first
2. Submerge the cartridge in the TSP solution
3. Soak for 4-8 hours (overnight is fine)
4. Remove and rinse thoroughly with a garden hose for 2-3 minutes
5. Allow to dry before reinstalling, or install wet if returning to service immediately

TSP residue will not cause foaming in a properly chlorinated pool at these rinse levels, but rinse well regardless.

Option 2 - Dish Soap Solution (Routine or Light Buildup)

Plain liquid dish soap is a gentler, widely available degreaser. It handles routine seasonal cleaning when buildup is moderate.

Recipe:

• 1 cup of plain dish soap (Dawn or equivalent, original formula - avoid anti-bacterial or added bleach variants)
• 5 gallons of water

Procedure:

1. Hose off the cartridge
2. Submerge and soak overnight
3. Rinse very thoroughly - dish soap produces more foam than TSP and needs extended rinsing
4. Confirm no suds remain before reinstalling

Important: If the cartridge goes back into service with soap residue remaining, the pool will foam heavily. Give it an extra rinse pass if unsure.

Option 3 - Baking Soda Soak (Deodorize and Light Clean)

A baking soda soak will not cut heavy grease or scale but can deodorize a musty cartridge and neutralize mild acidic buildup.

Recipe:

• 1 cup of baking soda
• 5 gallons of water

Soak for 1-2 hours. This is a maintenance step rather than a deep clean - use TSP or dish soap if the cartridge is visibly fouled.

Adding an Acid Step for Scale

If white or grey crusty deposits remain after the degreaser soak, add a second acid step:

• Fill a new bucket with 5 gallons of water
• Add 1 cup of muriatic acid slowly to the water (never the reverse)
• Soak the cartridge for 1-4 hours
• Rinse extremely thoroughly

Always complete the alkaline soak first - oil blocks acid penetration, and acid does not remove organic waste.

Full acid cleaning procedure: Cleaning Pool Filter with Muriatic Acid

DIY Cleaners for DE Filters

DE filter grids collect the same organic and mineral contamination as cartridges. The same two-step approach applies.

Annual deep clean (remove and soak):

1. Remove grids from the filter tank after backwashing
2. Hose off loose DE and debris
3. Soak in TSP or dish soap solution for 4-8 hours
4. Rinse thoroughly
5. Follow with muriatic acid soak if calcium deposits are visible
6. Inspect grids for tears before reinstalling
7. Recharge with fresh DE powder through the skimmer

Full procedure: How to Clean a DE Pool Filter

Sand Filters - No Soaking Required

Sand filters do not use cartridges or grids that you remove and soak. The standard cleaning method is backwashing - reversing the water flow to flush trapped debris out through the waste line.

For a deeper clean once per season, a sand filter cleaner chemical is added before backwashing. There is a homemade alternative using TSP:

1. With the pump off, add 1 cup of TSP dissolved in 1 gallon of water through the skimmer
2. Turn the pump to recirculate for 15 minutes
3. Let it sit for 8 hours (or overnight)
4. Backwash thoroughly

This loosens oil and grease from the sand bed that backwashing alone would not remove.

DIY vs. Commercial Cleaners - Which to Choose

Homemade solutions work well for routine seasonal maintenance. Commercial filter cleaners offer advantages in specific cases:

Use a homemade solution when:

• The filter needs a standard annual clean
• Contamination is oil and organic waste
• You have TSP or dish soap already on hand

Consider a commercial cleaner when:

• The cartridge fouls faster than it should (a sign of specific contamination)
• The filter has never been chemically cleaned and has years of buildup
• You want the convenience of a ready-mixed, purpose-formulated product

If you want to compare commercial options, see our review of the best commercial pool filter cleaner covering products tested on both sand and cartridge filters, or the Best Pool Cartridge Filter Cleaner for cartridge-specific picks.

You can also search for ready-to-use options: pool filter cleaner on Amazon

Cleaning Frequency

The right schedule depends on your filter type:

• Cartridge filters - chemical soak every 3 months during the swim season, plus at opening and closing
• DE filters - backwash when pressure rises 8-10 psi above clean baseline; full grid soak once per season
• Sand filters - backwash when pressure rises 8-10 psi; TSP treatment once per season

Pressure gauge readings are your most reliable indicator. A filter at 25 psi when it normally runs at 15 psi needs cleaning, regardless of when it was last done.

Full cleaning frequency guide: How Often to Clean Pool Filter

Safety Notes

TSP and muriatic acid require basic precautions:

• Wear rubber or chemical-resistant gloves
• Work outdoors or with good ventilation
• Keep solutions away from children and pets
• Add muriatic acid to water - never the reverse
• Neutralize used acid solution with baking soda before disposal (pour down drain with running water after neutralizing)

Dish soap is safe to handle without gloves, but avoid contact with eyes.

Related Guides

• How to Clean a Cartridge Pool Filter - full hose and soak procedure
• Cleaning Pool Filter with Muriatic Acid - acid step in detail
• How Often to Clean Pool Filter - cleaning schedule by filter type
• Pool Filter Pressure Too High - pressure readings after cleaning
• How to Clean a DE Pool Filter - DE grid teardown and soak