Pool & spa
Clearwater pH Plus Spa / Pool Balancer dupe
Why pay around £11.50 for Clearwater? The bulk active is Dense soda ash (sodium carbonate 99%) — 76% less per working litre than a typical shelf pack.
From the retail pack to the active and the mix
1 · Retail
Clearwater pH Plus Spa / Pool Balancer
1 kg bottle · £11.50 typical snapshot
None (dense soda ash)
2 · Active
Sodium carbonate (soda ash)
99% on the label
497-19-8Na2CO3
Bulk Dense soda ash (sodium carbonate 99%)
3 · Mix
1 g/L
£0.00 per working litre · 76% less than the shelf pack
- Active
- Sodium carbonate (soda ash)
- CAS
- 497-19-8
- Dupe
- Dense soda ash (sodium carbonate 99%)
- Saving
- 76% / 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
“Raises spa and pool pH quickly”
The chemical reality
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.
Active vs filler
99% Sodium carbonate (soda ash) · 1% carrier / filler — None (dense soda ash)
- Typical retail
- £11.50
- 1 kg bottle
- Estimated active cost
- £2.70
- Scaled from bulk £13.50 / 5 kg
- Indicative markup
- 4.3×
- Snapshot maths, not a live shop price
The Marketing Claim & The Catch
A 1 kg bottle pack of Clearwater pH Plus Spa / Pool Balancer typically retails around £11.50 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: Raises spa and pool pH quickly; Protects surfaces, seals and swimmers from acidic water; and Easy-dose granules.
The catch: 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.
- “Raises spa and pool pH quickly”
- “Protects surfaces, seals and swimmers from acidic water”
- “Easy-dose granules”
Proprietary Blend & Dosage Breakdown
The labelled active is Sodium carbonate (soda ash) at 99%. Everything else in the pack is none (dense soda ash).
Even when the pack is sold as “pure” or ready-to-use, the dose that actually does the work is Sodium carbonate (soda ash). 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 99% Dense soda ash (sodium carbonate 99%), mixed to 1 g/L.
- Labelled active
- Sodium carbonate (soda ash)
- 99%
- Carrier
- None (dense soda ash)
- Retail pack
- 1 kg bottle · £11.50
The Active Chemical Alternative (Dupe Stack)
The dupe stack is Dense soda ash (sodium carbonate 99%) at 99% bulk. Indexed as CAS 497-19-8, formula Na2CO3. Buy it as 5 kg for around £13.50 from Amazon UK.
Working strength: 1 g/L. Indicative cost £0.00 per diluted litre — 76% 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.
- Alkaline dust: wear gloves and goggles. Avoid inhaling powder; mix downwind or outdoors.
- Test pH first. A typical spa dose is about 1 g per litre of water (1 kg per 1,000 L) as a starting correction — always titrate.
- Predissolve granules in a plastic bucket of spa water, then distribute around the circulation return. Never dump onto the liner dry.
- Run the pump, retest after 30–60 minutes, and add more only if pH remains below 7.2.
- Store dry. Sodium carbonate cakes when damp.
Dilution recipe
1,000 L pool / spa volume
Working strength 1 g/L. Educational estimate from the listed ratio — check the SDS before you mix.
Chemical
1,000 grams
Dense soda ash (sodium carbonate 99%)
Water
1,000 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 | Clearwater pH Plus Spa / Pool BalancerAmazon UK search — listing, not a confirmed seller | Dense soda ash (sodium carbonate 99%) |
| Pack / unit | 1 kg bottle · £11.50 | 5 kg · £13.50 |
| Active | Sodium carbonate (soda ash) at 99%Carrier: None (dense soda ash) | 99% bulkNa2CO3 |
| CAS number | Not disclosed on pack | 497-19-8 |
| Working strength | Ready-to-use pack | Dilute 1 g/L |
| Cost per litre | £11.50 / pack | £0.00 / L mixed from bulk |
| Headline saving | Baseline | 76% cheaper |
| COSHH / PPE | Follow the branded SDS | Gloves. Chemical-resistant gloves (nitrile or neoprene)Eye protection. Indirect-vent splash goggles — not ordinary spectaclesVentilation. Use outdoors or with mechanical extraction |
Active ingredient and cheaper alternative — FAQ
What is the active ingredient in Clearwater?
Clearwater pH Plus Spa / Pool Balancer is labelled as Sodium carbonate (soda ash) at 99%. The carrier is None (dense soda ash). Pack size: 1 kg bottle. The bulk equivalent we index is Dense soda ash (sodium carbonate 99%) (CAS 497-19-8).
Is Dense soda ash (sodium carbonate 99%) safe on the intended surface?
Used at the listed working strength (1 g/L), 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 pH Plus Spa / Pool Balancer?
Yes. The bulk equivalent is Dense soda ash (sodium carbonate 99%) (CAS 497-19-8). Indicative saving 76% per working litre versus a pack that typically retails around £11.50. Working strength: 1 g/L. Live shop prices move.
How do you mix the Clearwater pH Plus Spa / Pool Balancer dupe stack?
Alkaline dust: wear gloves and goggles. Avoid inhaling powder; mix downwind or outdoors. Test pH first. A typical spa dose is about 1 g per litre of water (1 kg per 1,000 L) as a starting correction — always titrate. Predissolve granules in a plastic bucket of spa water, then distribute around the circulation return. Never dump onto the liner dry. Run the pump, retest after 30–60 minutes, and add more only if pH remains below 7.2. Store dry. Sodium carbonate cakes when damp.
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 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.
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
Phosphate remover and polyquat — not a shock, and not copper
Lanthanum chloride drops phosphate. A polymeric quat is a copper-free algicide. Neither replaces trichlor, dichlor or cal-hypo, and neither is alum floc.
More teardowns
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.
Pool & spa
Total Alkalinity TA Plus
Clearwater
- Retail pack
- £11.991 kg tub
- Raw active
- Food / technical grade sodium bicarbonate144-55-8
Standard baking soda sold at a 1,200% retail markup under spa branding.
£26.48Save 76% / L
Indicative DIY stack