OK, so I need to bump my CH up, and I am currently sitting at 110 or so.
Pool calculator shows that I need 410 oz (25.62 lbs) of calcium chloride to get to 250.
I have a bag of Dowflake Calcium Chloride (77-80%) in the garage that I used to melt ice in the driveway.
Is this OK to use, and does it matter if it is a bit old (say a couple of years or so)?
To put it in, just dump like I add salt, or is there a different method?