Not since I got the reactors hooked up. Before, I was trying to drip kalk at nite, but am just too lazy to do this every day, hence the reason for the Kalk reactor. I have my setup going pretty slow. Don't realy know if I need both or not. PH us now usually around 8.1-2. Before I got these hooked up, I could hardly get above 7.9.
Much better for me, since I get kind of busy, and don't get to spend alot of time managing the tank. Just fill top off container and clean the glass, and walk away.