How often should I shock?

Once a week as a routine; after any heavy bather event as needed.

How long until I can bathe?

15 minutes with the pump running and the cover off.

Does MPS replace chlorine or bromine?

No. MPS is an oxidiser, not a residual sanitiser. Continue chlorine or bromine for daily disinfection.

How long does a 1 kg pack last?

Around 38 weekly shocks for a 1500 L hot tub.

Is it safe for sensitive skin?

Yes. MPS forms few skin-irritant by-products and is the standard shock for sensitive bathers.

Will it work with bromine?

Yes. MPS clears combined bromine and reactivates the bromine bank for the next week.

What is MPS chemically?

Potassium peroxymonosulfate (KHSO5) at >= 47% active.

Why does MPS not raise chlorine?

MPS oxidises directly without donating chlorine atoms; sanitiser stays at the same chlorine level after dosing.

Does MPS raise total dissolved solids?

Yes. 17 g per 1000 L adds about 12 ppm sulphate. Refresh part of the water if sulphate exceeds 300 ppm.

Combined chlorine still high?

Repeat dose at 25 g per 1000 L; clean cartridge overnight.

Cloudy water after shock?

Run filter 24 hours; dose Sparkle Clarifier.

False zero on chlorine test?

Wait 15 minutes after dosing; some DPD kits are interfered with by MPS.

MPS vs chlorine shock?

MPS clears combined chlorine without raising free chlorine; chlorine shock raises free chlorine to 10 ppm and forces a wait before bathing.

MPS is a routine weekly oxidiser. ClO2 is a periodic biofilm-targeting deep clean.

Non Chlorine Shock Granules

Name: Non Chlorine Shock Granules
Brand: ClearSpa
SKU: wst-2
Availability: InStock
Rating: 5.0 (8 reviews)

Weekly non-chlorine shock for hot tubs and spas. A potassium peroxymonosulfate (MPS) oxidiser that clears combined chlorine or bromine and lets bathers back in within 15 minutes.

Clears combined chlorine and bromine in 15 minutes.
Restores active sanitiser without dosing extra chlorine.
Polishes water clarity after a heavy soak.
Compatible with chlorine, bromine, MPS and salt systems.
Safe to use just before guests arrive.