Consumer advocacy teardown
No More Scale Inhibitor alternative & active ingredient dupe
Stop paying £24.50 for Lo-Chlor. The bulk active is HEDP 60% phosphonate concentrate — 83% less per working litre than a typical pack.
- Active
- HEDP (etidronic acid)
- CAS
- 2809-21-4
- Dupe
- HEDP 60% phosphonate concentrate
- Saving
- 83% / 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.
The Marketing Claim & The Catch
A typical 1 litre pack of Lo-Chlor No More Scale Inhibitor is about £24.50 in pool & spa. That is a snapshot, not a live Amazon price — listings, sizes and deals move. The marketing line is that you are buying a finished lifestyle product, not a weighed chemical.
On the pack: Helps control calcium scale on tiles and salt-cell plates; and Sequesters metals to reduce green and brown staining.
The catch: A 15% phosphonate in a 1 litre bottle. Industrial 60% HEDP is the same sequestering chemistry; 50 ml of 60% in 10,000 litres is a typical maintenance dose.
- “Helps control calcium scale on tiles and salt-cell plates”
- “Sequesters metals to reduce green and brown staining”
Proprietary Blend & Dosage Breakdown
The labelled active is HEDP (etidronic acid) at 15%. Everything else in the pack is demineralised water.
At 15% active, most of what you pay for is carrier and packaging. The brand is selling convenience, fragrance and a label — not a uniquely potent molecule.
Branded working strength is whatever comes out of the bottle. The bulk alternative is 60% HEDP 60% phosphonate concentrate, mixed to 0.005 g/L (50 ml per 10,000 L).
- Labelled active
- HEDP (etidronic acid)
- 15%
- Carrier
- Demineralised water
- Retail pack
- 1 litre · £24.50
The Active Chemical Alternative (Dupe Stack)
The dupe stack is HEDP 60% phosphonate concentrate at 60% bulk. Indexed as CAS 2809-21-4, formula C2H8O7P2. Buy it as 5 litres for about £21.00 from Amazon UK.
Working strength: 0.005 g/L (50 ml per 10,000 L). Indicative cost £0.00 per diluted litre — 83% 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. Add 50 ml of 60% HEDP per 10,000 litres near a return jet, once a month as a guide.
- Hard-water fill: a double first dose is common, then test and watch the salt cell. This is a sequesterant, not a descaler for thick scale.
- 5 litres at 50 ml per 10 m³ is about 100 monthly doses. Do not mix in a bucket with chlorine or acid.
Mixing desk
Dilution calculator
Switch between filling a sprayer and covering a measured surface. Figures are educational estimates from the listed ratio — always check the SDS.
Formula
HEDP 60% phosphonate concentrate
- Concentrate
- 50 g
- grams of solid
- Water
- 10,000 L
- carrier volume
- Batch cost
- £0.21
- 10,000 L working solution
- Saved vs retail
- £244,999.79
- 100% · retail £245,000.00
Estimated coverage at the listed rate: 8.3 m².
Side-by-Side Price & Potency Comparison
Head-to-head comparison
| Measure | Retail brandedLo-Chlor | Raw active dupeDupeStack |
|---|---|---|
| Product | No More Scale InhibitorAmazon UK search — listing, not a confirmed seller | HEDP 60% phosphonate concentrate |
| Pack / unit | 1 litre · £24.50 | 5 litres · £21.00 |
| Active | HEDP (etidronic acid) at 15%Carrier: Demineralised water | 60% bulkC2H8O7P2 |
| CAS number | Not disclosed on pack | 2809-21-4 |
| Working strength | Ready-to-use pack | Dilute 0.005 g/L (50 ml per 10,000 L) |
| Cost per litre | £24.50 / L typical pack | £0.00 / L mixed from bulk |
| Headline saving | Baseline | 83% 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 Lo-Chlor?
Lo-Chlor No More Scale Inhibitor is labelled as HEDP (etidronic acid) at 15%. The carrier is Demineralised water. Pack size: 1 litre. The bulk equivalent we index is HEDP 60% phosphonate concentrate (CAS 2809-21-4).
Is HEDP 60% phosphonate concentrate safe on the intended surface?
Used at the listed working strength (0.005 g/L (50 ml per 10,000 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 Lo-Chlor No More Scale Inhibitor?
Yes. The bulk equivalent is HEDP 60% phosphonate concentrate (CAS 2809-21-4). Indicative saving 83% per working litre versus a typical £24.50 pack. Working strength: 0.005 g/L (50 ml per 10,000 L). Live shop prices move.
How do you mix the No More Scale Inhibitor dupe stack?
Wear gloves and goggles. Add 50 ml of 60% HEDP per 10,000 litres near a return jet, once a month as a guide. Hard-water fill: a double first dose is common, then test and watch the salt cell. This is a sequesterant, not a descaler for thick scale. 5 litres at 50 ml per 10 m³ is about 100 monthly doses. Do not mix in a bucket with chlorine or acid.
DupeStack provides chemical concentration data and educational mixing guides. Always review official manufacturer Safety Data Sheets (SDS) and comply with UK Health and Safety Executive (HSE) and COSHH regulations when handling concentrated substances. Some links on this site are affiliate links.
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DIY stack · 83% / L vs branded
£28.49indicative kit · Amazon cannot add a mixed search kit as one basket