Hey guys, i want to buy a good fail proof ato, since im plannin to dose kalk via ato. Recently my diy float swith failed and dumped all the fw in the tank.. since im going to start adding hard corals, im plannin to use kalk in ato. So i would like to buy a good ato but not being able to decide. Hydor is cheaper and available in my country India, as we have a distributor here. Tunze osmo is expensive and not easily available, so will have to arrange to buy online+40% duty.