How often should I deep-soak the cartridge?

Every 4 weeks for a domestic hot tub; every 2 weeks for a spa with high bather load.

How long should I soak the cartridge?

8-12 hours overnight is ideal. Do not exceed 24 hours.

What is the dilution ratio?

1 part concentrate to 10 parts warm tap water for standard soiling.

How many soaks does 1 L cover?

Approximately 10 standard soaks of a single cartridge in a 10 L bucket.

Is it safe for paper or polyester pleats?

Yes. The blend is pH-balanced for both materials when diluted as directed.

Will it remove calcium scale?

Yes. The chelators bind calcium and iron, lifting scale alongside organic soiling in the same soak.

Why does cleaning matter for sanitiser use?

A clogged filter circulates less water, so sanitiser is not distributed evenly. Cleaning restores even contact and cuts sanitiser demand.

What pH is the diluted solution?

Approximately pH 10.5 at 1:10 dilution. Strong enough to lift soiling, mild enough for filter media.

Can I use it in a dishwasher?

No. The cleaner is formulated for filter media, not for hard surfaces, and dishwasher heat will degrade it.

Cartridge still smells after rinsing?

Soak again in fresh dilute solution; if smell persists, the cartridge is at end of life.

Foam appearing after refitting?

Surfactant residue remains. Rinse thoroughly and dose 25 ml Foam Away per 1000 L.

Pressure rises again within a week?

Bather load is high or sanitiser is below band. Test sanitiser and shock if needed; clean cartridge weekly.

Cleaner vs filter granules?

Cleaner is for cartridges; granules are for sand or in-tub filter elements that cannot be removed.

Cleaner vs hot tub flush?

Hot tub flush cleans the pipework; cartridge cleaner cleans the removable filter element. Use both during full water changes.

Filter Cartridge Cleaner

Name: Filter Cartridge Cleaner
Brand: ClearSpa
SKU: wc-1
Availability: InStock
Rating: 5.0 (3 reviews)

Restore filter flow and trapped-debris capacity overnight. A concentrated alkaline cleaner that strips body oils, sun cream and hard-water deposits from pleated filter cartridges.

Dissolves body oils, lotions and grease in a single overnight soak.
Removes mineral scale build-up between the pleats.
Restores up to 90% of original filter flow rate.
Extends cartridge life by 2-3 cleaning cycles before replacement.
Will not damage paper or polyester filter media when used as directed.