Consumer advocacy teardown
Domestos Original Thick Bleach alternative & active ingredient dupe
Stop paying £2.20 for Domestos. The bulk active is Household thin bleach (sodium hypochlorite ~5%) — 77% less per working litre than a typical pack.
- Active
- Sodium hypochlorite
- CAS
- 7681-52-9
- Dupe
- Household thin bleach (sodium hypochlorite ~5%)
- Saving
- 77% / 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 750 millilitres pack of Domestos Original Thick Bleach is about £2.20 in household cleaning. 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: Kills 99.9% of bacteria and viruses; Clings to the pan for a thicker clean; and The nation's bleach.
The catch: Sodium hypochlorite plus a thickener so it clings to ceramic. Thin household bleach is the same oxidiser without the brand, the dye and the TV campaign. Never mix it with acids or ammonia.
- “Kills 99.9% of bacteria and viruses”
- “Clings to the pan for a thicker clean”
- “The nation's bleach”
Proprietary Blend & Dosage Breakdown
The labelled active is Sodium hypochlorite at 4.5%. Everything else in the pack is water, thickener, surfactant, fragrance.
At 4.5% 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 5% Household thin bleach (sodium hypochlorite ~5%), mixed to 1:9.
- Labelled active
- Sodium hypochlorite
- 4.5%
- Carrier
- Water, thickener, surfactant, fragrance
- Retail pack
- 750 millilitres · £2.20
The Active Chemical Alternative (Dupe Stack)
The dupe stack is Household thin bleach (sodium hypochlorite ~5%) at 5% bulk. Indexed as CAS 7681-52-9, formula NaOCl. Buy it as 5 litres for about £2.50 from Amazon UK.
Working strength: 1:9. Indicative cost £0.05 per diluted litre — 77% 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.
- Gloves and ventilation. Never mix bleach with acids, vinegar, toilet descalers or ammonia — chlorine gas.
- For a toilet bowl, use neat thin bleach and leave 10 minutes, then flush.
- For hard surfaces, 1 part bleach to 9 parts water. Make fresh; hypochlorite dies in the bottle once diluted.
- Do not use on coloured fabrics, stone, or aluminium.
- Store cool and dark, upright, away from children.
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
Household thin bleach (sodium hypochlorite ~5%)
- Concentrate
- 500 ml
- millilitres of liquid
- Water
- 4.5 L
- carrier volume
- Batch cost
- £0.25
- 5 L working solution
- Saved vs retail
- £14.42
- 98% · retail £14.67
Estimated coverage at the listed rate: 40 m².
Side-by-Side Price & Potency Comparison
Head-to-head comparison
| Measure | Retail brandedDomestos | Raw active dupeDupeStack |
|---|---|---|
| Product | Domestos Original Thick BleachAmazon UK search — listing, not a confirmed seller | Household thin bleach (sodium hypochlorite ~5%) |
| Pack / unit | 750 millilitres · £2.20 | 5 litres · £2.50 |
| Active | Sodium hypochlorite at 4.5%Carrier: Water, thickener, surfactant, fragrance | 5% bulkNaOCl |
| CAS number | Not disclosed on pack | 7681-52-9 |
| Working strength | Ready-to-use pack | Dilute 1:9 |
| Cost per litre | £2.93 / L typical pack | £0.05 / L mixed from bulk |
| Headline saving | Baseline | 77% cheaper |
| COSHH / PPE | Follow the branded SDS | Gloves. Chemical-resistant gloves (nitrile or neoprene)Ventilation. Use outdoors or with mechanical extraction |
Active ingredient and cheaper alternative — FAQ
What is the active ingredient in Domestos?
Domestos Original Thick Bleach is labelled as Sodium hypochlorite at 4.5%. The carrier is Water, thickener, surfactant, fragrance. Pack size: 750 millilitres. The bulk equivalent we index is Household thin bleach (sodium hypochlorite ~5%) (CAS 7681-52-9).
Is Household thin bleach (sodium hypochlorite ~5%) safe on the intended surface?
Used at the listed working strength (1:9), the dupe is the same chemistry as the branded pack for kettles, ceramics and washable hard surfaces. 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 Domestos Original Thick Bleach?
Yes. The bulk equivalent is Household thin bleach (sodium hypochlorite ~5%) (CAS 7681-52-9). Indicative saving 77% per working litre versus a typical £2.20 pack. Working strength: 1:9. Live shop prices move.
How do you mix the Domestos Original Thick Bleach dupe stack?
Gloves and ventilation. Never mix bleach with acids, vinegar, toilet descalers or ammonia — chlorine gas. For a toilet bowl, use neat thin bleach and leave 10 minutes, then flush. For hard surfaces, 1 part bleach to 9 parts water. Make fresh; hypochlorite dies in the bottle once diluted. Do not use on coloured fabrics, stone, or aluminium. Store cool and dark, upright, away from children.
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 · 77% / L vs branded
£8.48indicative kit · Amazon cannot add a mixed search kit as one basket