Foam Away

Drop-in foam destroyer for hot tubs and spas. A concentrated silicone-based antifoam that knocks down a foam head in seconds without affecting sanitiser or pH.

• Knocks down a foam head in 60 seconds.
• Stays effective up to 7 days per dose.
• Has no effect on chlorine, bromine or pH.
• Lifts surface dust and pollen out with the foam.
• Compatible with chlorine, bromine, MPS and salt-water systems.

Sizes and prices

• 1L: £9.89
• 2.5L: £15.09
• 5L: £23.75
• 10L: £41.09
• 20L: £75.75
• 25L: £93.08

When you need it

• A foam head forms when the jets switch on.
• Bathers have just exited and foam is rising fast.
• Calcium hardness is low and the tub keeps foaming.
• You have just changed the water and a residual film is foaming.
• Sun cream or detergent has entered the water.

How to use

1. Test sanitiser, pH and calcium hardness; if hardness is below 150 ppm, dose calcium too.
2. Switch the pump to low circulation, not full jets.
3. Pour 25 ml of Foam Away per 1000 L directly across the foam head.
4. Wait 60 seconds; foam should collapse back to the surface.
5. If foam returns within 24 hours, redose at half-strength and clean the filter.

Dosing guide

Standard knock-down dose. Heavy foaming or low calcium tubs may need a second half-dose after 12 hours; rebalance calcium hardness for a long-term fix.

• For 1,000 L (small spa), add 25 ml to reach Knock-down.
• For 1,500 L (typical hot tub), add 40 ml to reach Knock-down.
• For 2,000 L (large hot tub), add 50 ml to reach Knock-down.
• For 5,000 L (swim spa), add 125 ml to reach Knock-down.
• For 1,500 L, add 20 ml after 12 h to reach Heavy foam top-up.

How it works

A water-dispersible silicone (polydimethylsiloxane) emulsion stabilised with non-ionic surfactants for hot tub and spa use.

Foam is air trapped in a film of water held together by surfactant-like body oils and detergent residues. Silicone droplets penetrate the foam wall and reduce its surface tension to the point where the wall ruptures, collapsing the foam back to liquid.

Foam is a symptom of low calcium hardness combined with high organic load. While the long-term fix is to balance calcium and clean the filter, a fast antifoam keeps the tub usable while you address the cause.

Frequently asked questions

How fast does it work?

Foam typically collapses within 60 seconds of dosing.

Does it affect chlorine or bromine?

No. The silicone emulsion has no chemical interaction with chlorine, bromine or pH.

Can I bathe straight after dosing?

Wait 30 minutes for the antifoam to disperse fully through the water.

How many doses does 1 L cover?

Around 25 standard doses for a 1500 L hot tub.

Is it safe for inflatable hot tubs?

Yes. The product is safe for vinyl, acrylic and inflatable surfaces.

Will it work in a pool?

Yes. Use 25 ml per 1000 L for pool foam knockdown.

What is the active ingredient?

Polydimethylsiloxane (PDMS), the standard food-grade antifoam used worldwide.

Does it raise total dissolved solids?

Marginally. Long-term reliance on antifoam can creep TDS toward 1500 ppm; refresh part of the water if doses become weekly.

Why is calcium hardness related to foam?

Calcium binds the surfactant-like body oils that would otherwise produce foam. Soft water has nothing to bind the oils, so foam forms easily.

Foam keeps coming back?

Test calcium hardness; raise to 150-200 ppm with Calcium Hardness Increaser.

Cloudy water after dosing?

Reduce dose to 15 ml per 1000 L next time and run filter for 24 hours.

Sanitiser dropping after dosing?

Shock with MPS at 17 g per 1000 L; check filter is clean.

Foam Away vs household antifoam?

Household antifoams often contain solvents that attack acrylic. Foam Away is hot tub safe and pH-neutral.

Foam Away vs sparkle clarifier?

Foam Away knocks foam down in seconds. Clarifier groups fine particles for filtering and is not a foam fix.