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My Alk has always been a bit high, any common reason that would cause that I should be looking at? All other params are good. Alk. 3.89meq at Cal 420 ppm, should be around 3.45 meq.
Could be the salt mix- make up a gallon of saltwater with your specific gravity and check the alkalinity. Also are you dosing anything like two part? Alk that high isnt a problem juts hopefully it doesnt rise and drop the calcium in the water.