Last month CH was 325
Last week CH was 350
Today CH is 375 (tested twice with same results)
What's causing it to rise? Pool was re-plastered on May 2nd and all my numbers have been in range but now CH is rising
Added couple trichlor tabs to bring up CYA few weeks ago but it shouldn't have anything to do with rising CH rising.
FC-not checked cause pool still in full sunlight but normally 3.5 to 4 before adding bleach at sunset
Water is crystal clear