Quote Originally Posted by Watermom View Post
You kinda want to err on the side of caution ---- making the window longer than it probably needs to be before retesting so that you don't: 1)waste CYA testing reagent
2)think your CYA is all dissolved, decide it is too low and add more and then end up with too much.

It is easy to add more CYA but hard to get rid of it if you have it too high.
Good point.