Pool Non-Chlorine Shock - Potassium Monopersulphate Oxidiser

Non-chlorine pool shock based on potassium peroxymonosulphate (MPS). Oxidises sweat, sun cream and organic load without raising chlorine, so swimmers are back in the pool within 15 minutes.

• Oxidises chloramines and organic contaminants without adding chlorine.
• Lets bathers re-enter the pool 15 minutes after dosing.
• Cuts the strong chlorine smell at the water surface.
• Restores active free chlorine by breaking down combined chlorine.
• Adds zero cyanuric acid and no calcium.

Sizes and prices

• 5kg: £44.00
• 10kg: £87.75
• 25kg: £219.00

When you need it

• You need a fast pool turnover and cannot wait 4 hours for chlorine to drop.
• Combined chlorine is at 0.3 ppm or higher.
• You want a weekly shock that does not lift CYA or hardness.
• Cyanuric acid is already at the upper limit.
• Hot weather means a chlorine shock would burn off before doing its job.

How to use

1. Test pH and bring into 7.2-7.6 band first.
2. Pre-dissolve the dose in a 10 L bucket of pool water.
3. Pour the solution evenly across the surface with circulation on.
4. Run filtration for at least 1 hour before bathing.
5. Retest free and combined chlorine after 4 hours; combined should be below 0.3 ppm.
6. Repeat weekly during heavy use.

Dosing guide

Standard weekly dose 17 g per m³; double dose for heavy use or after a storm. MPS works best at pH 7.2-7.4; re-balance pH after dosing.

• For 20 m³, add 340 g to reach Weekly shock.
• For 40 m³, add 680 g to reach Weekly shock.
• For 60 m³, add 1.0 kg to reach Weekly shock.
• For 40 m³, add 1.4 kg to reach Heavy use double dose.
• For 100 m³, add 1.7 kg to reach Commercial weekly.

How it works

Potassium peroxymonosulphate (MPS) compound at typically 47% active oxygen content, sometimes called potassium monopersulfate or oxone.

MPS releases active oxygen on contact with water. The active oxygen oxidises ammonia, urea, sweat and other organics that would otherwise consume chlorine, freeing the chlorine bank to sanitise instead.

Pools shock for two reasons: kill living organisms (chlorine job) or oxidise dead organic load (MPS job). Using MPS for the second job spares chlorine and avoids the bather wait time.

Frequently asked questions

When can I swim again?

15 minutes after dosing once circulation has run a full turnover.

Does it sanitise?

No. MPS oxidises organics but does not kill bacteria or algae. Run alongside a chlorine bank, not as a replacement.

How often?

Weekly for a typical domestic pool, twice a week in commercial or heavy-use pools.

Pack sizes?

1 kg, 5 kg and 25 kg tubs. Sealed sachets available for plant rooms.

Can I use it instead of chlorine?

No. MPS does not sanitise. You still need a chlorine or bromine bank.

Will it bleach swimming costumes?

Less than chlorine, but extended contact will oxidise dyes. Rinse costumes after use.

What is the active ingredient?

Potassium peroxymonosulphate (MPS) at 47% active oxygen.

Why is it acidic?

MPS contains potassium bisulphate as the buffer, which dissolves slightly acidic.

Does it interfere with chlorine tests?

Yes. MPS reads as combined chlorine on standard DPD kits for 24-48 hours after dosing.

Combined chlorine not dropping?

Add a chlorine shock; MPS alone will not break heavy chloramine load.

False total chlorine reading?

Wait 48 hours or use an MPS-resistant DPD test kit.

MPS vs chlorine shock?

Chlorine kills bacteria and algae; MPS oxidises organic load. Use both as a routine: MPS weekly, chlorine for algae or biofilm.

MPS vs persulphate?

Same family. MPS (peroxymonosulphate) is the pool standard; sodium persulphate is a different product used in soil and groundwater.