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is there different types of sharp sand? reason I ask is someone told me theres sharp sand for building and sharp sand for concreting.? I have read about mixing soft/sharp sand etc.. and now confused!!!!!

Hello everyone, I have a detailed question here. As I understand it so far, I don't have any of this in my house. I.E No bond to the water, gas supply or central heating. I am planning to do this myself, but not a qualified electrician. I have read the official jargon on the subject, and...