Thus far, I haven't done any water treatment at all but I've got hold of some PH strips and am shocked to find that the PH of my water is massively high. I knew we had very hard water but the strips go up to 6.8 and it's definitely at 6.8, if not higher

Anyhow, I've got hold of some Burton Water Crystals which suggest they should be added to the grist before mashing. But, it doesn't say how much - should I shove the whole 220g in for a 5 gallon brew?
The other question I have is, how do you measure the PH of the mash - do you do it at the end or half way through or what? As always, any advice is welcomed
