The bottom line comes down to your needs. If you are cool running suppliments you have to add Kalkawaser and Carbonate buffer. At different times.
One for Calcium (kalk) one for KH (carbonate buffer). There is no way around it. Best to do it at different times to avoid precipitaion of Calcium Carbonate.
The calcium reactor is like a constant feed of both. Keep in mind if you don't de-gas enough you can have pH issues with a reactor as well. An answer to an earlier query, you really don't want or need to direct feed to your return pump. It won't de-gas the reactor effluant and probably have too high of feed rate. Resulting in an over dose of KH and Ca2+
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