Pool & spa
Clearwater Non-Chlorine Shock / Spa Oxidiser dupe
Why pay around £18.99 for Clearwater? The bulk active is Potassium monopersulphate triple salt (MPS) — 71% less per working litre than a typical shelf pack.
From the retail pack to the active and the mix
1 · Retail
Clearwater Non-Chlorine Shock / Spa Oxidiser
1 kg tub · £18.99 typical snapshot
Potassium sulphate and potassium hydrogen sulphate (triple salt)
2 · Active
Potassium peroxymonosulphate (MPS)
85% on the label
70693-62-8KHSO5
Bulk Potassium monopersulphate triple salt (MPS)
3 · Mix
0.012 g/L (12 g/m³ as a typical spa shock)
£0.00 per working litre · 71% less than the shelf pack
- Active
- Potassium peroxymonosulphate (MPS)
- CAS
- 70693-62-8
- Dupe
- Potassium monopersulphate triple salt (MPS)
- Saving
- 71% / L
Saving is per litre of working-strength mix versus a typical pack price, not versus the DIY kit total. Shop prices move — always check the listing.
Label teardown
What the pack promises versus what the label chemistry actually is.
The marketing claim
“Shock without adding chlorine or closing the spa for hours”
The chemical reality
‘Non-chlorine shock’ is Oxone-type MPS — the same triple salt used in bulk oxidisers. A 1 kg spa tub is a markup on a 5 kg bucket. It oxidises organics; it is not a sanitiser on its own.
Active vs filler
85% Potassium peroxymonosulphate (MPS) · 15% carrier / filler — Potassium sulphate and potassium hydrogen sulphate (triple salt)
- Typical retail
- £18.99
- 1 kg tub
- Estimated active cost
- £5.60
- Scaled from bulk £28.00 / 5 kg
- Indicative markup
- 3.4×
- Snapshot maths, not a live shop price
The Marketing Claim & The Catch
A 1 kg tub pack of Clearwater Non-Chlorine Shock / Spa Oxidiser typically retails around £18.99 in pool & spa. That is a UK shelf-price snapshot for the maths on this page — not a live shop quote or a manufacturer RRP. Listings, sizes and deals move. The marketing line is that you are buying a finished lifestyle product, not a weighed chemical.
On the pack: Shock without adding chlorine or closing the spa for hours; and Restores sparkle after a heavy bather load.
The catch: ‘Non-chlorine shock’ is Oxone-type MPS — the same triple salt used in bulk oxidisers. A 1 kg spa tub is a markup on a 5 kg bucket. It oxidises organics; it is not a sanitiser on its own.
- “Shock without adding chlorine or closing the spa for hours”
- “Restores sparkle after a heavy bather load”
Proprietary Blend & Dosage Breakdown
The labelled active is Potassium peroxymonosulphate (MPS) at 85%. Everything else in the pack is potassium sulphate and potassium hydrogen sulphate (triple salt).
Even when the pack is sold as “pure” or ready-to-use, the dose that actually does the work is Potassium peroxymonosulphate (MPS). The rest is how they get it into a bottle you will pick up.
Branded working strength is whatever comes out of the bottle. The bulk alternative is 85% Potassium monopersulphate triple salt (MPS), mixed to 0.012 g/L (12 g/m³ as a typical spa shock).
- Labelled active
- Potassium peroxymonosulphate (MPS)
- 85%
- Carrier
- Potassium sulphate and potassium hydrogen sulphate (triple salt)
- Retail pack
- 1 kg tub · £18.99
The Active Chemical Alternative (Dupe Stack)
The dupe stack is Potassium monopersulphate triple salt (MPS) at 85% bulk. Indexed as CAS 70693-62-8, formula KHSO5. Buy it as 5 kg for around £28.00 from Amazon UK.
Working strength: 0.012 g/L (12 g/m³ as a typical spa shock). Indicative cost £0.00 per diluted litre — 71% below a typical branded pack on a per-litre basis, before you reuse leftover bulk.
Follow the mixing method and the supplier SDS. Wear the listed PPE. Do not mix incompatible oxidisers, acids or ammonia.
- Wear gloves and goggles. Broadcast 12 g per m³ (about 12 g per 1,000 litres) with the pump running. Do not mix in a bucket with chlorine.
- MPS is an oxidiser, not a residual sanitiser. Keep bromine or chlorine in range.
- 5 kg is five 1 kg spa tubs. Store dry. Test after shocking — some kits read MPS as chlorine.
Dilution recipe
1,500 L pool / spa volume
Working strength 0.012 g/L (12 g/m³ as a typical spa shock). Educational estimate from the listed ratio — check the SDS before you mix.
Chemical
18 grams
Potassium monopersulphate triple salt (MPS)
Water
1,500 litres
Carrier / diluent
0% concentrate · 100% water by working volume (solids are dissolved into the water share).
Required PPE
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Side-by-Side Price & Potency Comparison
Head-to-head comparison
| Measure | Retail brandedClearwater | Raw active dupeDupeStack |
|---|---|---|
| Product | Non-Chlorine Shock / Spa OxidiserAmazon UK search — listing, not a confirmed seller | Potassium monopersulphate triple salt (MPS) |
| Pack / unit | 1 kg tub · £18.99 | 5 kg · £28.00 |
| Active | Potassium peroxymonosulphate (MPS) at 85%Carrier: Potassium sulphate and potassium hydrogen sulphate (triple salt) | 85% bulkKHSO5 |
| CAS number | Not disclosed on pack | 70693-62-8 |
| Working strength | Ready-to-use pack | Dilute 0.012 g/L (12 g/m³ as a typical spa shock) |
| Cost per litre | £18.99 / pack | £0.00 / L mixed from bulk |
| Headline saving | Baseline | 71% cheaper |
| COSHH / PPE | Follow the branded SDS | Gloves. Chemical-resistant gloves (nitrile or neoprene)Eye protection. Indirect-vent splash goggles — not ordinary spectacles |
Active ingredient and cheaper alternative — FAQ
What is the active ingredient in Clearwater?
Clearwater Non-Chlorine Shock / Spa Oxidiser is labelled as Potassium peroxymonosulphate (MPS) at 85%. The carrier is Potassium sulphate and potassium hydrogen sulphate (triple salt). Pack size: 1 kg tub. The bulk equivalent we index is Potassium monopersulphate triple salt (MPS) (CAS 70693-62-8).
Is Potassium monopersulphate triple salt (MPS) safe on the intended surface?
Used at the listed working strength (0.012 g/L (12 g/m³ as a typical spa shock)), the dupe is the same chemistry as the branded pack for pool and spa water once dosed from a test kit. That is not a blanket all-clear: read the supplier SDS, wear the listed PPE, keep acids away from hypochlorite, and follow UK HSE/COSHH rules. Wellness teardowns are supplements, not medicines.
Is there a cheaper alternative to Clearwater Non-Chlorine Shock / Spa Oxidiser?
Yes. The bulk equivalent is Potassium monopersulphate triple salt (MPS) (CAS 70693-62-8). Indicative saving 71% per working litre versus a pack that typically retails around £18.99. Working strength: 0.012 g/L (12 g/m³ as a typical spa shock). Live shop prices move.
How do you mix the Non-Chlorine Shock / Spa Oxidiser dupe stack?
Wear gloves and goggles. Broadcast 12 g per m³ (about 12 g per 1,000 litres) with the pump running. Do not mix in a bucket with chlorine. MPS is an oxidiser, not a residual sanitiser. Keep bromine or chlorine in range. 5 kg is five 1 kg spa tubs. Store dry. Test after shocking — some kits read MPS as chlorine.
DupeStack provides chemical concentration data and educational mixing guides only. Wellness pages compare food supplements, not medicines or prescribed treatments. Always review the supplier Safety Data Sheet (SDS) and comply with UK Health and Safety Executive (HSE) and COSHH regulations when handling concentrated substances. Mixing and storage are at your own risk. Some links are affiliate advertisements (Amazon Associates, eBay Partner Network, and Awin when those programmes are live). Commissions do not change listed concentrations or calculator output.
Related guides
Pool guide
Pool shock, bromine, floc and algaecide — not the same tub
Cal-hypo shock, dichlor granules, MPS oxidiser, BCDMH bromine, alum floc, copper algicide and thiosulphate reducer are different salts. Match the job before you buy a spa-shop tub.
Pool guide
PHMB and bromine pool care: chlorine-free sanitising decoded
How polyhexanide (PHMB) and sodium bromide work as chlorine-free pool sanitisers — activation chemistry, compatibility rules, and links to DupeStack teardowns.
Pool guide
Pool and spa basics: pH, chlorine and cyanuric acid without the brand kit
What Clearwater-style pH Plus, pH Minus, chlorine and CYA actually are — soda ash, dry acid, TCCA and stabiliser — with links to DupeStack teardowns.
More teardowns
Pool & spa
Clearwater pH Plus Spa / Pool Balancer
Clearwater
- Retail pack
- £11.501 kg bottle
- Raw active
- Dense soda ash (sodium carbonate 99%)497-19-8
pH Plus is dense soda ash — 99% sodium carbonate, CAS 497-19-8. Pool-shop packaging turns a £2.70/kg commodity into an £11.50/kg ritual.
Pool & spa
Clearwater pH Minus
Clearwater
- Retail pack
- £9.991.5 kg
- Raw active
- Sodium bisulphate (dry acid)7681-38-1
pH Minus is dry acid — sodium bisulphate. Pool retail is a small tub; chemical suppliers sell it in 5 kg lots for a third of the per-kilo price.
Pool & spa
Clearwater Multifunction Chlorine Tablets
Clearwater
- Retail pack
- £42.005 kg
- Raw active
- TCCA 90% chlorine tablets (200 g)87-90-1
The tablet is 90% TCCA — the same stabilised chlorine used in bulk 200 g pucks. ‘Multifunction’ is a pinch of clarifier and a lot of packaging. Buy TCCA, dose from an SDS, and keep cyanuric acid in range.
£40.00Save 71% / L
Indicative DIY stack