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Gypsum , calcium sulphate dihydrate, calcium sulphate, gypsum powder , agricultural gypsum. 
Agricultural Natural Gypsum 250g, Calcium sulphate powder. 
Gypsum is an important ingredient in your CVG mushroom substrate. Assists in the correct ph level and the fruiting of your shrooms. 3 to 4% is an ideal measurement to your substrate. 

Gypsum powder

£7.50Price
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