Household cleaning
Dri-Pak Soda Crystals dupe
Why pay around £2.49 for Dri-Pak? The bulk active is Sodium carbonate decahydrate (soda crystals) — 36% less per working litre than a typical shelf pack.
From the retail pack to the active and the mix
1 · Retail
Dri-Pak Soda Crystals
1 kg · £2.49 typical snapshot
None (washing-soda crystals)
2 · Active
Sodium carbonate decahydrate
100% on the label
6132-02-1Na2CO3·10H2O
Bulk Sodium carbonate decahydrate (soda crystals)
3 · Mix
50 g per litre for general cleaning / laundry booster
£0.08 per working litre · 36% less than the shelf pack
- Active
- Sodium carbonate decahydrate
- CAS
- 6132-02-1
- Dupe
- Sodium carbonate decahydrate (soda crystals)
- Saving
- 36% / 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
“Cleans washing machines, sinks and drains”
The chemical reality
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).
Active vs filler
100% Sodium carbonate decahydrate · 0% carrier / filler — None (washing-soda crystals)
- Typical retail
- £2.49
- 1 kg
- Estimated active cost
- £1.60
- Scaled from bulk £7.99 / 5 kg
- Indicative markup
- 1.6×
- Snapshot maths, not a live shop price
The Marketing Claim & The Catch
A 1 kg pack of Dri-Pak Soda Crystals typically retails around £2.49 in household cleaning. 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: Cleans washing machines, sinks and drains; Laundry booster and water softener; and Cuts grease on hard surfaces.
The catch: 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).
- “Cleans washing machines, sinks and drains”
- “Laundry booster and water softener”
- “Cuts grease on hard surfaces”
Proprietary Blend & Dosage Breakdown
The labelled active is Sodium carbonate decahydrate at 100%. Everything else in the pack is none (washing-soda crystals).
Even when the pack is sold as “pure” or ready-to-use, the dose that actually does the work is Sodium carbonate decahydrate. 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 100% Sodium carbonate decahydrate (soda crystals), mixed to 50 g per litre for general cleaning / laundry booster.
- Labelled active
- Sodium carbonate decahydrate
- 100%
- Carrier
- None (washing-soda crystals)
- Retail pack
- 1 kg · £2.49
The Active Chemical Alternative (Dupe Stack)
The dupe stack is Sodium carbonate decahydrate (soda crystals) at 100% bulk. Indexed as CAS 6132-02-1, formula Na2CO3·10H2O. Buy it as 5 kg for around £7.99 from Amazon UK.
Working strength: 50 g per litre for general cleaning / laundry booster. Indicative cost £0.08 per diluted litre — 36% 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 recommended — hot soda-crystal liquor is alkaline and can irritate skin. Do not mix with acids or bleach in one bucket.
- Dissolve 50 g of crystals per litre of hot water for sinks, floors and a laundry booster (about 30–50 g in a hot wash).
- For a washing-machine clean: 200 g in the drum on an empty hot cycle. For drains: a handful followed by hot water — this is not caustic drain gel.
- 5 kg is five Dri-Pak 1 kg bags. Store dry; the decahydrate cakes if it picks up moisture.
- Anhydrous soda ash is stronger per gram (about 18.5 g anhydrous ≈ 50 g crystals) — convert if that is the sack you buy.
Dilution recipe
5 L sprayer
Working strength 50 g per litre for general cleaning / laundry booster. Educational estimate from the listed ratio — check the SDS before you mix.
Chemical
250 grams
Sodium carbonate decahydrate (soda crystals)
Water
5 litres
Carrier / diluent
0% concentrate · 100% water by working volume (solids are dissolved into the water share).
Required PPE
Loading calculator…
Side-by-Side Price & Potency Comparison
Head-to-head comparison
| Measure | Retail brandedDri-Pak | Raw active dupeDupeStack |
|---|---|---|
| Product | Soda CrystalsAmazon UK search — listing, not a confirmed seller | Sodium carbonate decahydrate (soda crystals) |
| Pack / unit | 1 kg · £2.49 | 5 kg · £7.99 |
| Active | Sodium carbonate decahydrate at 100%Carrier: None (washing-soda crystals) | 100% bulkNa2CO3·10H2O |
| CAS number | Not disclosed on pack | 6132-02-1 |
| Working strength | Ready-to-use pack | Dilute 50 g per litre for general cleaning / laundry booster |
| Cost per litre | £2.49 / pack | £0.08 / L mixed from bulk |
| Headline saving | Baseline | 36% 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
Are soda crystals the same as Vanish Oxi Action?
No. Soda crystals are sodium carbonate (a mild alkali and water softener). Vanish-style oxy powders are sodium percarbonate — carbonate plus locked hydrogen peroxide. Use the Vanish teardown for the oxidiser; this one is the alkali.
Can I mix soda crystals with vinegar?
They cancel. The fizz is carbon dioxide as alkali meets acid — not extra cleaning power. Use one or the other, then rinse. Never mix in a sealed bottle.
How do you mix the Soda Crystals dupe stack?
Gloves recommended — hot soda-crystal liquor is alkaline and can irritate skin. Do not mix with acids or bleach in one bucket. Dissolve 50 g of crystals per litre of hot water for sinks, floors and a laundry booster (about 30–50 g in a hot wash). For a washing-machine clean: 200 g in the drum on an empty hot cycle. For drains: a handful followed by hot water — this is not caustic drain gel. 5 kg is five Dri-Pak 1 kg bags. Store dry; the decahydrate cakes if it picks up moisture. Anhydrous soda ash is stronger per gram (about 18.5 g anhydrous ≈ 50 g crystals) — convert if that is the sack you buy.
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.
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£16.00Save 36% / L
Indicative DIY stack