I think i’m starting to understand it better now, but correct me if i’m wrong. So looking up ‘calcareous’ it says this ‘Calcareous
) is an adjective meaning "mostly or partly composed of calcium carbonate
", in other words, containing lime
or being chalky
and I do remember my rock being sort of chalky at one point when i had it out my tank a while back and it had dried. So obviously my rock must ‘leak’ (if thats the correct term) alkalinity which is why my tank water will have gone from being more acidic to being more alkaline ?
but i don’t understand what you mean by ‘it works faster on the rocks’ I’m assuming you mean there is a reaction between the water and rock that occurs faster because the water is more acidic and the rock is more alkalinity, which is what causes the rock to ‘leak’ alkalinity ?