Four laundry jobs, four molecules
The laundry aisle sells ‘limescale protection’, ‘machine care’, ‘colour rescue’ and ‘antibacterial freshness’ as if they were flavours of one powder. They are not. Read the SDS before you buy another grocery box.
Hard-water wash builder → zeolite 4A or a citrate sequesterant (the two Calgon SKUs). Dishwasher softener compartment → coarse sodium chloride. Heater / drum descale → citric acid on an empty hot cycle. A dye that ran → dithionite, not Oxi. Organic stains on washable cloth → percarbonate. Odour on a dry sofa → cyclodextrin, not a quat. A cationic laundry cleanser is a different bottle again.
Calgon is two SKUs — zeolite powder vs citrate tabs
Calgon 3-in-1 powder is mostly zeolite 4A (sodium aluminosilicate, CAS 1318-02-1) — a detergent ion-exchange builder. The box doses 25–75 g by water hardness. A 5 kg sack of detergent-grade 4A is the same mineral. It is not pond clinoptilolite, not soda crystals, and it does not dissolve limescale the way citric does.
Calgon 4-in-1 tablets declare 15–30% polycarboxylates (sodium polyacrylate family, CAS 9003-04-7). Older Express tabs also listed trisodium citrate (CAS 6132-04-3). The everyday hardness job is a teaspoon of food-grade citrate in the drawer — 10 g per wash — not a 75 g/L Service-it drum clean. Do not treat the powder and the tabs as one product.
Dishwasher salt is just coarse NaCl
Finish dishwasher salt is sodium chloride (CAS 7647-14-5) — coarse, high-purity granules for the machine’s ion-exchange resin. A 25 kg sack of PDV or labelled water-softener salt is the same regenerant. Pour it neat into the salt compartment; do not dissolve it first.
Do not use iodised table salt — anti-caking agents can clog the valve. Soft-water areas may not need it. This is not a detergent, not a rinse aid, and it does not belong in the Calgon drawer.
Citric descale vs soda crystals vs every-wash builder
Dr. Beckmann Service-it is about 7.5% citric acid (CAS 5949-29-1) for an empty hot maintenance wash. That is the heater descale. Bulk citric plus water beats the 250 ml grocery bottle; rinse the drum and run a short rinse if the manual says so.
Soda crystals (sodium carbonate decahydrate) are a milder laundry alkali — grease-cutting and a precipitating softener, not a zeolite builder and not a citric descale. Use them as the Dri-Pak teardown says. Never mix citric and a strong alkali in one jug.
Colour-run is a reducer; Oxi is an oxidiser
Dr. Beckmann Colour Run Remover is 15–30% sodium dithionite (CAS 7775-14-6) in a 75 g sachet. About 20 g of 85% textile hydrosulphite in 5 L matches the sachet’s active. It strips loose dye. It liberates sulphur dioxide if it meets acid — keep it away from vinegar, Service-it, Viakal and bleach.
Vanish Oxi Action is sodium percarbonate (CAS 15630-89-4) for tea, grass and soak bleaching. About 20 g/L is a pre-soak. It will not reverse a dye transfer, and mixing it with dithionite or hypochlorite is a wasted oxidiser fight. The carpet-and-stain guide covers the Oxi versus Vax split.
Quat cleanser and cyclodextrin are not softeners
Dettol laundry cleanser is about 2.4% mixed quats (BAC/DDAC family, CAS 68424-85-1). Dilute BAC 50 to that band and dose the fabric-softener drawer — it is a cationic biocide, not Calgon and not PCMX surface Dettol. Do not mix quats with anionic detergent or bleach in a jug.
Febreze-style fabric refresher is hydroxypropyl-β-cyclodextrin (CAS 128446-35-5) at about 1% — an odour host, not a disinfectant and not a hardness builder. Bicarbonate in a dish is a different odour job again. One chemistry per pass; rinse between if you change tack.
FAQ
- Is Calgon the same as dishwasher salt?
- No. Calgon 3-in-1 powder is zeolite 4A (CAS 1318-02-1) dosed into a wash. Calgon 4-in-1 tabs are a polycarboxylate / citrate sequesterant. Dishwasher salt is coarse sodium chloride (CAS 7647-14-5) for the machine’s ion-exchange resin. Different compartment, different job.
- Will Calgon descale the washing-machine heater?
- Not the way citric does. Service-it liquid is about 7.5% citric acid on an empty hot maintenance wash. Every-wash zeolite or citrate does not replace that quarterly heater descale. See the Service-it teardown.
- Is colour-run remover the same as Vanish Oxi?
- No. Vanish Oxi is sodium percarbonate (CAS 15630-89-4) — an oxidiser soak. Colour Run Remover is sodium dithionite (CAS 7775-14-6), a reducing bleach. Never mix either with acid or hypochlorite.
More household cleaning guides
Household guide
Household acids and alkalis decoded — limescale, rust and never-mix rules
Household guide
Drain and oven cleaners: sulphuric acid vs caustic soda — never swap blindly
Household guide
Disinfectants decoded: bleach, Dettol and hand gel — hypochlorite vs PCMX vs IPA
Household guide
Carpets and laundry stains: percarbonate vs machine surfactant
Related teardowns
Live stacks this guide points at — mix maths and DIY affiliate links on each page.
Household cleaning
3 in 1 Limescale Protection Powder
Calgon
- Retail pack
- £3.50500 grams
- Raw active
- Detergent-grade zeolite 4A (sodium aluminosilicate)1318-02-1
Calgon 3-in-1 powder is mostly zeolite 4A (CAS 1318-02-1) — a detergent ion-exchange builder, not citric acid and not soda crystals. The box lists more than 30% zeolites plus a pinch of polycarboxylate and perfume. A 5 kg sack of detergent-grade 4A is the same softening mineral. This is not pond clinoptilolite and not a kettle descaler.
Household cleaning
4-in-1 Limescale Protection Tablets
Calgon
- Retail pack
- £10.50390 grams (30 tablets)
- Raw active
- Trisodium citrate dihydrate (food grade)6132-04-3
Current Calgon 4-in-1 tabs declare 15–30% polycarboxylates (sodium polyacrylate family, CAS 9003-04-7) plus perfume. Older Express tabs also listed sodium citrate. The everyday hardness job is a teaspoon of food-grade trisodium citrate — not a monthly citric drum descale (that is Service-it).
Household cleaning
Dishwasher Salt
Finish
- Retail pack
- £4.502 kg
- Raw active
- PDV / water-softener salt (sodium chloride, coarse)7647-14-5
Finish dishwasher salt is sodium chloride (CAS 7647-14-5) — coarse, high-purity salt for the machine’s ion-exchange softener. The molecule is the product. A 25 kg sack of PDV or water-softener salt is the same regenerant without the 2 kg grocery-box tax. This is not tablet detergent, not rinse aid, and not table salt (anti-caking agents can clog the softener).
Household cleaning
Service-it Washing Machine Cleaner
Dr. Beckmann
- Retail pack
- £3.50250 millilitres
- Raw active
- Citric acid monohydrate (food grade)5949-29-1
The liquid Service-it bottle is 5–10% citric acid — a kettle descaler poured into an empty drum. Food-grade citric at about 75 g/L is the same heater-and-door-seal wash without the 250 ml appliance-aisle tax. This is not the powder Deep Clean (that is percarbonate — see Vanish).
Household cleaning
Original Colour Run Remover
Dr. Beckmann
- Retail pack
- £2.5075 grams
- Raw active
- Sodium dithionite ~85% (textile hydrosulphite)7775-14-6
The 75 g sachet is a reductive bleach: 15–30% sodium dithionite (CAS 7775-14-6), not Vanish percarbonate and not hypochlorite. About 20 g of 85% textile hydrosulphite in a 5 L soak matches the sachet’s active without the laundry-aisle tax. It liberates sulphur dioxide if it meets acid — never mix it with vinegar, descale or bleach.
Household cleaning
Vanish Oxi Action Fabric Stain Remover
Vanish
- Retail pack
- £9.001 kg tub
- Raw active
- Sodium percarbonate (food/technical grade)15630-89-4
Sodium percarbonate is a solid hydrogen-peroxide adduct. The pink tub is perfume, dye and a scoop. Technical-grade percarbonate is the same oxidiser used in bulk laundries.
Household cleaning
Soda Crystals
Dri-Pak
- Retail pack
- £2.491 kg
- Raw active
- Sodium carbonate decahydrate (soda crystals)6132-02-1
Dri-Pak’s bag is sodium carbonate decahydrate (CAS 6132-02-1) — washing soda. The molecule is the product. A 5 kg sack of the same crystals is the cupboard staple without the 1 kg grocery markup. This is not Vanish (that is percarbonate) and not borax substitute (sesquicarbonate).
Household cleaning
Antibacterial Laundry Cleanser
Dettol
- Retail pack
- £4.991.5 litres
- Raw active
- Benzalkonium chloride (BAC 50) diluted to ~2.4%68424-85-1
Dettol laundry cleanser is about 2.4% mixed quats (dialkyl dimethylammonium + benzalkonium) — the same cationic family as Zoflora, sold as a scented conditioner-drawer pour. Dilute BAC 50 to 2.4% and you have the biocide without the 1.5 L cotton-breeze tax. It is not PCMX Dettol spray and not bleach.
Household cleaning
Fabric Refresher
Febreze
- Retail pack
- £3.50500 millilitres
- Raw active
- Hydroxypropyl-β-cyclodextrin (HP-β-CD)128446-35-5
The odour trap in Febreze fabric spray is hydroxypropyl-β-cyclodextrin (CAS 128446-35-5) at about 1% — a sugar ring that hosts smelly molecules. The television advert is the perfume. A 1% cyclodextrin wipe is the same host chemistry without the Unstopables tax. It is not a disinfectant and it is not bicarbonate in a trigger.
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.