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Sodium Sesquicarbonate - Borax Substitute & TSP Substitute Laundry Booster


SKU: RD10071

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Sodium Sesquicarbonate (Crex)

Borax Substitute & TriSodium Phosphate Substitute


Mutipurpose cleaner Water softener & Laundry Booster

A unique crystalline form of sodium sesquicarbonate, which is classified as a non-irritant and therefore lends itself for use in a range of consumer products. It offers an intermediate pH/alkalinity that lies between soda ash and sodium bicarbonate making it an effective cleaning substitute for Borax and Trisodium phosphate (TSP).



Laundry - water softening powder

Washing machine - Limescale prevention powder

Conservation of copper and copper alloys

Scouring agent

Laundry booster



Chemical name: Sodium sesquicarbonate, Sodium monohydrogendicarbonate

Appearance: White powder
CAS No: 533-96-0
Formula: Na2CO3-NaHCO3.2H2O
Pouring density: 0.80g/cm3
Typical packing density: 0.97g/cm3
pH of 2% solution at 20 C: 9.9
Solubility at 20 C: 17.1g/100g water
Alkali equivalent: 44.1% Na2O
Molecular weight: 226.03
Median size: 160-200 microns



Sodium sesquicarbonate is used in bath salts, swimming pools, as an alkalinity source for water treatment, and as a phosphate free trisodium phosphate replacement for heavy duty cleaning.
Sodium sesquicarbonate is used in the conservation of copper and copper alloy artifacts that corrode due to contact with salt (called "bronze disease" due to its effect on bronze). The chloride from salt forms copper(I) chloride. In the presence of oxygen and water, even the small amount of moisture in the atmosphere, the cuprous chloride forms copper(II) chloride and hydrochloric acid, the latter of which dissolves the metal and forms more cuprous chloride in a self-sustaining reaction that leads to the entire destruction of the object. Treatment with sodium sesquicarbonate removes copper(II) chlorides from the corroded layer.
It is also used as a precipitating water softener, which combines with hard water minerals (calcium- and magnesium-based minerals) to form an insoluble precipitate, removing these hardness minerals from the water. This makes it effective for keeping washing machines and dishwashers free from limescale buildup.

When mixed with vinegar / acetic acid or citric acid the resulting product fizzes. This makes a safer, effective and eco friendly drain opener and sink unblocker.

An excellent scouring agent.


Click here for MSDS

Click here for Specification sheet

Click here for Technical sheet