Dissolving 50g of the powder in 500ml of water makes a 10% solution.
If kept stored in a screw top bottle this will keep for a minimum 3 months.
One teaspoon (5ml) of this 10% stock solution is equivalent to one campden tablet.
Whist this is an effective and economical steriliser it is not a cleanser.
Soiled items will need to be thoroughly cleansed before sterilising with Sodium Metabisulphite