carbonate hardness

[kurtyboh]

can your carbonate hardness be too high? I know a high reading gives you a stable ph but I'm just wondering if it can be too high cuz my reading is over 440ppm(where my test max's out at).

thanks
kurt

 

[mattrox]

Try taking it to an LFS for testing to confirm your results. Also check pH. With KH that high I'd expect a pH of 8.2 to 8.4.