Yes, I think a lot of people would switch to a calcium reactor at my uptake levels. I just don’t like them. I don’t like the extra complexity, extra failure points, and pH lowering effect (including lack of pH raising effect of carbonate). Harder to dial-in than just setting a dosing schedule. As I understand it they don’t dose minor or trace elements, or at least not enough, so you are still running dosers. I know many people are happy with them, and they can be a great solution. I just don’t like them
I have a CO scrubber, and it works great to raise pH. I don’t have it recirculating with my skimmer cup because that seems like a serious failure point to me if the skimmer cup fills up. Raises mine about 0.2 units, which is a lot.
I don’t love how it does nothing to flatten out the daily pH swing of about 0.4 units. I started another thread about massive aeration in my overflow to try to reduce the swing and increase pH (which I haven’t actually tried yet because my overflow chamber is full of feather dusters). I have a small frag tank as well as refugium in the sump, and since I started lighting the frag tank opposite cycle from my tank (refug was already on opposite cycle) at
@RandyC ’s suggestion, it has reduced my downswing at night by around 0.1 unit. I currently have my CO2 scrubber disconnected but my air intake from my garage which has a consistent low CO2 level of around 400-500 ppm. No internal combustion happens in my garage. This all gives me a swing of 8.0-8.3, which is better than it was. When it gets super hot this summer and I can’t leave windows open I’ll probably start using the scrubber again.
I like Kalkwasser, and it is getting popular again. Everything old is new again
I’ve thought about switching to a kalk hybrid system with a kalk reactor dosing as much as I can consistently, a separate ATO to make up the rest of evaporation, and extra dosing for the extra demand of the Ca/alk/Mg/minor/trace elements since I don’t think the kalk would be enough and it doesn’t have minor/trace elements. This would add complexity, which I’m not a fan of. Also the downside of accidental overdose is catastrophe rather than inconvenience, which is a bit scary. But the pH raising effect of calcium hydroxide is pretty great.
Kenny, if you are only dosing kalk at night (when consumption is lower) and no other alk supplement, I’d be worried that you having crazy alk swings. Do you test with a Trident or something where it can give you at least 4 readings over the 24 hours? If not, I think you should and it might be eye-opening. In order to keep my alk steady I have to dose about half as much from 12a-6a to avoid a big spike in the morning.