First, get your pH up. 6.9 is the minimum pH for a vinyl pool or a damaged liner could result. If it reads 6.8, that's the bottom of the scale and may be much lower. You need to add Borax or Soda Ash today, right now! I don't know S/A amounts, but I would start with 1 box of Borax, wait a few hours, check again, add more Borax until the pool is AT LEAST 7.0
Soda Ash will raise your T/A as well as your pH so in this case it may be good. Or you can add Baking Soda to raise pH as the same time as the Borax.
CYA is a tad low...but get your pH fixed first.
Bookmarks