Hi, I went to get my water tested and these are the results.

Chlorine 8 I have been putting pucks in, two large into the skimmer
PH 7.1 just added 1/4 box borax got that info on line here for my 70,000 litre pool
Calcium 100
ALkalinity 170

Can I still swim with these numbers? how do I lower the alkaline? and how much would I use? Could I buy it at Canadian Tire, or a home hardware store,,,,,,,,whatever I need. I have a vinyl pool............
Thanks again everyone.