Crushed Coral

[Leo2o915]

When adding it to a tank in a bag by the output of the filter to raise ur Kh how long til you start seeing changes to keep an eye on it so it won’t go too high ? 

[Ninjoma]

In my experience, the KH has never gotten too high with crushed coral inside my filters. One cool thing about crushed coral is, the higher it brings your PH, the slower it dissolves, so it sorta self regulates. I would probably test the water once a week.