Limestone Hills? Keeping Beni in Sumi water
... You said yours is a flowthrough system. An in no filtration at all or just minimal with trickling overflow water exchange? The reason I ask is because I would have assumed bioactivity would have consumed a reasonable portion of the carbonate load........
If it is a straight up flow through system, would it be feasable to run the water through a carbonate hungry bog garden before hitting the pond? Just curious.