Quote Originally Posted by steveinaz View Post
CH of my fill water is 120ppm, I tested it this morning. I think a aprtial drain will be worth the effort. Since I won't be dealing with the added complication of new plaster, dropping TA after re-fill should be a litte easier, right?
Next question, what is the TA of your fill water? You will need about a 50% replacement to get your CH in range from around 700 ppm. You might even need a bit more than that.