How often should I flush the pipework?

At every quarterly water change, or after any heavy bather event.

Do I have to remove the filter?

Yes. The filter would be ruined by biofilm release and surfactants. Set it aside and refit a clean one after refill.

How long should the soak be?

8-12 hours overnight is standard. Up to 24 hours for tubs that have not been flushed for years.

How many flushes does 1 L cover?

Five 1500 L flushes at 200 ml per flush.

Is it safe for inflatable hot tubs?

Yes. The flush is safe for vinyl, acrylic and inflatable surfaces when used as directed.

Will it damage my pump or heater?

No. The active dilution is well below thresholds for pump impellers, seals or heater elements.

What is biofilm chemically?

A polysaccharide gel produced by bacteria that anchors them to surfaces and shelters them from sanitiser.

Why can sanitiser not remove biofilm?

Free chlorine and bromine react at the surface and do not penetrate the gel matrix. Specific surfactant chemistry is needed to break the matrix.

Does it raise total dissolved solids?

Briefly, but the entire flush is drained, so the new fill starts at TDS zero.

Lots of foam during the flush?

Expected. Reduce jet speed; foam will subside when jets stop. Drain after the soak.

Smell still present after refill?

Drain a second time and re-flush at the same dose; very neglected tubs sometimes need two cycles.

Sanitiser demand still high after refill?

Replace the filter cartridge and shock the new fill; old filter or unwashed shell carries biofilm forward.

Hot tub flush vs filter cleaner?

Flush cleans pipework biofilm before a water change. Filter cleaner cleans the filter element. Use both at every water change.

Hot tub flush vs household bleach?

Bleach reacts at the surface and rarely penetrates biofilm. The flush uses surfactants and chelators that strip the matrix.

Hot Tub Flush

Name: Hot Tub Flush
Brand: ClearSpa
SKU: wc-3
Availability: InStock
Rating: 5.0 (8 reviews)

Strip biofilm from hot tub pipework before a water change. A single 200 ml dose dissolves the slime layer that hides bacteria from your sanitiser and keeps demand high.

Penetrates and dissolves biofilm inside the pipework and jets.
Frees trapped body oils, lotions and dead skin.
Resets sanitiser efficiency for the new water fill.
Removes the cause of cloudy water that returns within days of a refill.
Helps tubs pass routine bacterial swab tests.