Aquatic essential calcium reactor how to?

[whatcaneyedo]

I like to keep the internal pH around 6.6, let your pH monitor or controller determine how much gas is needed to achieve that. How much flow you need through the reactor depends on the calcium carbonate demand of the tank. Start slow (probably just a slow drip), keep testing and adjusting Alkalinity and Calcium, and gradually turn up the flow until the output matches the consumption.