I typically run CH 275 - 300. I didn't add any calcium intentionally (no Ca shock, Ca chloride). Today I was doing my weekly chemistries and find 400 and 425. What can cause such a jump? Thank you.
Here are my other latest numbers:
Salt 1800 ( about 10 days ago)
CYA </= 40 (8 days ago; too cloudy just now to run test)