Benefits- Its' cheap. You can buy pickling lime, same thing. It's a balanced Ca
supplement that does not add sodium and chloride ions to your water(most if not all others do). Those ions can cause problems, ex. increasing salinity, etc., if not reduced through PWC
's. It' reduces PO4
and increases water quality a few ways. It improves skimmer function( I get at least 3x as much skimmate) and directly bonds PO4
so it can't cause problems. It can also help raise PH, which is often low due to high indoor CO2
levels, etc. If using an auto top off or drip doser it can create more stability by adding Ca
constantly to keep up w/ demands, and FW
to decrease salinity fluctuations from evap.
FWIW I love it! I will not go back to using two part alone for Ca
Drawback- When dosed to fast it can raise PH too quickly and/or high. It needs to be dosed slowly, generally. Kalkwasser has a very high PH ( about 12). When handling it care should be taken to avoid contact w/ skin and especially eyes.
Here is a great article on Kalk