Filter Cleaner Granules

Powerful alkaline granules that strip oils, lotions and biofilm from sand, glass-bead and ceramic filter media. Use for the periodic deep clean that a backwash alone cannot deliver.

• Dissolves trapped body oils and lotions inside the filter bed.
• Removes biofilm that hides bacteria from sanitiser.
• Restores filter flow and pressure to baseline.
• Extends sand or glass-bead media life by up to 12 months.
• Reduces backwash frequency once dosed.

Sizes and prices

• 1kg: £12.98
• 2.5kg: £25.62
• 5kg: £46.68
• 10kg: £88.80
• 20kg: £173.05
• 25kg: £215.17

When you need it

• Backwash water still runs grey after several cycles.
• Filter pressure remains high even after backwashing.
• A sour smell rises from the filter housing.
• Sanitiser demand has crept up week on week.
• Filter media has not been deep-cleaned for 6 months.

How to use

1. Backwash and rinse the filter to clear loose debris.
2. Switch the pump off and isolate the filter.
3. Dose 100 g of granules per 25 kg of filter media via the strainer or skimmer.
4. Leave the filter to soak for 8-12 hours with no flow.
5. Backwash for at least 5 minutes until water runs clear, then rinse for 1 minute.
6. Return the filter to filter mode and run circulation for 4 hours before bathing.

Dosing guide

Standard deep-clean dose. For heavily fouled commercial filters double the dose and extend the soak to 24 hours.

• For 10 kg media (small spa filter), add 40 g to reach Standard clean.
• For 25 kg media (residential pool), add 100 g to reach Standard clean.
• For 50 kg media (large pool), add 200 g to reach Standard clean.
• For 25 kg media (commercial), add 200 g to reach Heavy clean.
• For 100 kg media (commercial), add 400 g to reach Standard clean.

How it works

An alkaline granular blend of sodium-based builders and surfactants designed for sand, glass-bead and ceramic filter media. Free of phosphates and chlorine.

On contact with water, the granules raise local pH inside the bed and release surfactants that lift the oily organic matrix coating each grain. The released grease and biofilm are then flushed out during the next backwash, exposing fresh media surface for filtration.

Sand and glass beds capture body oils that cannot be removed by backwashing alone. Within 6-12 months these oils channel water flow, harbour biofilm and shelter bacteria from sanitiser. A periodic chemical clean restores the entire bed and prevents premature media replacement.

Frequently asked questions

How often should I chemically clean my filter?

Every 6 months for residential pools; every 3 months for hot tubs and high-load commercial pools.

Can I use it on cartridge filters?

Use ClearSpa Filter Cartridge Cleaner for cartridges. These granules are formulated for bulk media.

How long should the soak be?

8-12 hours for residential filters; up to 24 hours for heavily fouled commercial filters.

How many cleans does 1 kg cover?

Around 10 cleans of a 25 kg residential pool filter at the standard 100 g dose.

Is it safe for glass-bead media?

Yes. The blend is compatible with sand, glass beads, zeolite and ceramic filtration media.

Does it work with salt-water systems?

Yes. The cleaner is salt-system safe and will not damage chlorinator cells.

Why does sand need chemical cleaning?

Body oils bind to silica grains and cannot be backwashed away. The alkali in the cleaner saponifies the oils so they release on the next backwash.

Will it raise total dissolved solids?

Marginally, since most product is rinsed to waste during backwash.

Why must I wait 4 hours before bathing?

To ensure all surfactant has rinsed out of the bed and sanitiser has redistributed.

Pool went cloudy after the clean?

Loose debris flushed back into the pool. Run filter for 24 hours and add 50 ml Sparkle Clarifier per 1500 L.

Skin irritation after refitting?

Insufficient rinse. Backwash for another 5 minutes then dose Non-Chlorine Shock and retest before bathing.

Filter pressure rises again next week?

Bather load is high or sanitiser is low. Hold sanitiser in band and shock weekly to slow oil build-up.

Granules vs cartridge cleaner?

Granules clean bulk media inside a sealed housing; cartridge cleaner is a soak liquid for removable pleated cartridges.

Granules vs hot tub flush?

Flush cleans pipework biofilm before a water change. Granules clean the filter media itself. Use flush first, then clean the filter.