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Thanks I agree.The combination cant be beat (In my opinion)
They complement eachother very well, not only will you have the pH elevation, but using kalk in addition to a CalRx will enable you to tune the reactor much more "mildly" saving CO² and media so you wont have to worry about refilling the tank and media as much.
7.6 to 7.8What is low ph?
A properly tuned carx will have no impact on your tanks ph.