Yes, I use one on my DIY Kalk reactor. I have it on a timer to dose twice during the night (it drips a bit fast to add it all in one dose). It takes a bit of trial and error to get it just right but it works for me. Once and a while it will get an air lock in it but that is rare. I have been using it this way for about 6 months now. I love that I don't have to add fresh water all the time now and I boost my calcium too. Never mind the stability of the tank is much better as well.
I add about a gallon a day to my 130 gallon tank.
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