Kalk Precip

[untamed]

Once you trigger the precipitation, it will pull Ca/Alk out of the system. It is a threshold. Once you cross, you can loose a lot of Ca/Alk quickly.

BTW...check your pumps. If you were running this close to precipitation, it likely first occuring inside any PH in the system. The heat causes the reaction to occur more easily. If one could see inside one's pumps, they would give warning to when you are close to pushing the Kalk too far...

If the pump impellers are coated, soak them in vinegar to break up the Ca.