Calcium Reactor Refill?

My 5lb last over six months. Same with the madia. It really all depends on the demand need for the reactor.
 
Dejavu is right on. It's completely dependent on your usage. If you give us your BPM and effluent rate, people with similar setups might be able to give you some rough estimates.

I'm 10lbs tank, 20mL/min and run roughly 5 months on media, 9-12 on CO2.
 
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