I've found Kalk
to be very effective at maintaining my Ca
, and my tank isn't much more than 40 gal
, including the sump volume.
Coraline alone seemed to drain my Ca
levels down faster than I could replace with two part liquids. Using the A/B parts, I was constantly fighting to maintain balance (mostly adding more Ca
). Once I switched to kalk
I find the balance to be quite consistent.
It is a pain in the butt, however. I also believe that I have experienced some Ph swings which I attribute to troubles with my skimmer. OH in the kalk
needs to react with CO2
to minimize Ph swing and a lot of that reaction can occur within the skimmer. I drip Kalk
24/7 equal to evaporation. So far, I have not had to mix the kalk
to maximum strength to replace the demand.