Cold water pasteurization is one of the simplest and most beginner-friendly methods for preparing bulk substrates especially for straw or hydrated fuel pellets. Instead of relying on heat, this method uses hydrated lime and cold water to kill off unwanted microbes while preserving beneficial organisms that support healthy mycelium growth.
But getting the lime-to-water ratio right is key to its success. Too little, and contaminants survive. Too much, and you risk harming the mycelium. That’s where this calculator comes in.
Just enter the amount of water you’re using (in litres), and we’ll instantly give you the correct amount of hydrated lime to use for safe and effective cold water pasteurization. Simple, fast, and accurate so you can prep your substrate with confidence.
NOTE: You must use Hydrated Lime that is low in magnesium.