Household cleaning
Dri-Pak Borax Substitute dupe
Why pay around £2.99 for Dri-Pak? The bulk active is Sodium sesquicarbonate (borax substitute) — 60% less per working litre than a typical shelf pack.
From the retail pack to the active and the mix
1 · Retail
Dri-Pak Borax Substitute
500 grams · £2.99 typical snapshot
None (mineral powder)
2 · Active
Sodium sesquicarbonate
100% on the label
533-96-0Na2CO3·NaHCO3·2H2O
Bulk Sodium sesquicarbonate (borax substitute)
3 · Mix
20 g per litre for laundry soak / general cleaning
£0.04 per working litre · 60% less than the shelf pack
- Active
- Sodium sesquicarbonate
- CAS
- 533-96-0
- Dupe
- Sodium sesquicarbonate (borax substitute)
- Saving
- 60% / 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
“Laundry booster and stain soak after borax was withdrawn”
The chemical reality
Borax substitute is sodium sesquicarbonate (CAS 533-96-0) — not borax, not soda crystals, not bicarbonate. Dri-Pak’s 500 g box is a grocery pour of the same salt sold in 5 kg sacks. The EU reclassified borates; this is the carbonate/bicarbonate double salt that replaced the cupboard staple.
Active vs filler
100% Sodium sesquicarbonate · 0% carrier / filler — None (mineral powder)
- Typical retail
- £2.99
- 500 grams
- Estimated active cost
- £1.10
- Scaled from bulk £10.99 / 5 kg
- Indicative markup
- 2.7×
- Snapshot maths, not a live shop price
The Marketing Claim & The Catch
A 500 grams pack of Dri-Pak Borax Substitute typically retails around £2.99 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On the pack: Laundry booster and stain soak after borax was withdrawn; Gentler than soda crystals, stronger than bicarbonate; and Clean and Natural mineral compound.
The catch: Borax substitute is sodium sesquicarbonate (CAS 533-96-0) — not borax, not soda crystals, not bicarbonate. Dri-Pak’s 500 g box is a grocery pour of the same salt sold in 5 kg sacks. The EU reclassified borates; this is the carbonate/bicarbonate double salt that replaced the cupboard staple.
- “Laundry booster and stain soak after borax was withdrawn”
- “Gentler than soda crystals, stronger than bicarbonate”
- “Clean and Natural mineral compound”
Proprietary Blend & Dosage Breakdown
The labelled active is Sodium sesquicarbonate at 100%. Everything else in the pack is none (mineral powder).
Even when the pack is sold as “pure” or ready-to-use, the dose that actually does the work is Sodium sesquicarbonate. 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 sesquicarbonate (borax substitute), mixed to 20 g per litre for laundry soak / general cleaning.
- Labelled active
- Sodium sesquicarbonate
- 100%
- Carrier
- None (mineral powder)
- Retail pack
- 500 grams · £2.99
The Active Chemical Alternative (Dupe Stack)
The dupe stack is Sodium sesquicarbonate (borax substitute) at 100% bulk. Indexed as CAS 533-96-0, formula Na2CO3·NaHCO3·2H2O. Buy it as 5 kg for around £10.99 from Amazon UK.
Working strength: 20 g per litre for laundry soak / general cleaning. Indicative cost £0.04 per diluted litre — 60% 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 — alkaline dust can irritate skin and eyes. Do not mix with acids or bleach in one bucket.
- Dissolve 20 g per litre of warm water for a pre-wash soak or floor wash. For a stubborn stain, make a thick paste with a little water and dwell before the wash.
- A 5 kg sack is ten 500 g grocery boxes. Store dry; sesquicarbonate cakes if it picks up moisture.
- This is milder than soda crystals at the same grams-per-litre — do not expect caustic oven-cleaner strength.
- Rinse food-contact surfaces. Keep the sack labelled and away from children.
Dilution recipe
5 L sprayer
Working strength 20 g per litre for laundry soak / general cleaning. Educational estimate from the listed ratio — check the SDS before you mix.
Chemical
100 grams
Sodium sesquicarbonate (borax substitute)
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 | Borax SubstituteAmazon UK search — listing, not a confirmed seller | Sodium sesquicarbonate (borax substitute) |
| Pack / unit | 500 grams · £2.99 | 5 kg · £10.99 |
| Active | Sodium sesquicarbonate at 100%Carrier: None (mineral powder) | 100% bulkNa2CO3·NaHCO3·2H2O |
| CAS number | Not disclosed on pack | 533-96-0 |
| Working strength | Ready-to-use pack | Dilute 20 g per litre for laundry soak / general cleaning |
| Cost per litre | £2.99 / pack | £0.04 / L mixed from bulk |
| Headline saving | Baseline | 60% 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
Is borax substitute the same as Dri-Pak soda crystals?
No. Soda crystals are sodium carbonate decahydrate (CAS 6132-02-1). Borax substitute is sodium sesquicarbonate (CAS 533-96-0) — a milder alkali sitting between bicarbonate and washing soda. See the soda-crystals teardown for the stronger laundry alkali.
Is this real borax?
No. True borax is sodium tetraborate (CAS 1303-96-4), withdrawn from EU/UK cleaning shelves. Sesquicarbonate is a different molecule with a similar pH band. Do not hunt technical borax for laundry.
How do you mix the Borax Substitute dupe stack?
Gloves recommended — alkaline dust can irritate skin and eyes. Do not mix with acids or bleach in one bucket. Dissolve 20 g per litre of warm water for a pre-wash soak or floor wash. For a stubborn stain, make a thick paste with a little water and dwell before the wash. A 5 kg sack is ten 500 g grocery boxes. Store dry; sesquicarbonate cakes if it picks up moisture. This is milder than soda crystals at the same grams-per-litre — do not expect caustic oven-cleaner strength. Rinse food-contact surfaces. Keep the sack labelled and away from children.
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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£18.00Save 60% / L
Indicative DIY stack