Hydrated lime for pasteurizing straw, gorse or sawdust for growing oyster mushrooms.
 
This hydrated lime is low in magnesium, high in calcium and raises PH. Other types of lime - such as garden lime or dolomite lime - are high in magnesium, & are not appropriate for mushroom substrate pasteurization. 
 
Please note this hydrated lime is not suitable for pickling /  water glassing eggs etc.
 
This is for use with a simple cold-water method of pasteurisation -- which is a cheaper safer alternative to heat pasteurisation. 
 
For straw soak use 2-3g/L. Soak straw for 12-24hrs, drain for 4-12 hours, mix in spawn and bag into straw bags with pre-punched holes.
 
>> Read up all about how to grow oyster mushrooms on straw here
 
Please Google "Hydrated Lime Safety Precautions" and read before use. Hydrated lime can cause burns to skin and eyes in its powdered form if handled incorrectly.