Pool completely remodeled. Filled end of April with 120 CH water which was brought up to 250 at that time. All has been pretty normal, controlling rising pH daily and tracking TA and everything else, except that CH seems somewhat odd. I tested last month and got 270. Testing today gives 350-400 depending on the end point interpretation on the CH test, using the 10 ml sample. What is causing the CH to rise that much after little more than 2 months? Pool water has been crystal clear but now I notice some calcium deposits on the lowest grout line above the water line. Could this be due to the rising CH? Here are the other numbers from this afternoon:
FC - 4
CC - 0.2
PH - 7.8
TA - 70
CYA - 30
Water temp - 80 deg
FC - 4
CC - 0.2
PH - 7.8
TA - 70
CYA - 30
Water temp - 80 deg