Water chemistry question--carbonates??
An unusual situation: I recently noticed a white chalky substance that has precipitated on my gravel and glass. Accompanying this was a drop in KH, so I am suspecting that something has caused my carbonates to precipitate. Does anyone know what may have caused this?
The only thing I can imagine is that it would have something to do with the plant fertilizers I am using: small amounts of dry macronutrients (Potassium Nitrate, Monopotassium Phospate, Potassium Sulfate) and traces. Could an imbalance or overdose of one of those caused this precipitation?