Quote Originally Posted by kjh9835 View Post
FC 12 this morning, 10 this evening. pH 8.2 both times.
Add some acid (pH Minus or muriatic acid) as soon as you can.

When a testkit registers 8.2, it really means 8.2 or HIGHER! With your alkalinity readings, the pH is going to tend to rise pretty quickly, until the alkalinity is lower.