I used kalk in the make up water only for as long as it took me to build a kalk reactor. you cannot get a high enough concentration in top off water to make it worth it in a high growth sps system.
I had a gravity top off of 110 gal resivoir in the garage that fed my calk reactor and then went into the tank via a float valve.. no pumps. well I used one pump on my kalk reactor on a timer that would cirulate the kalk in the reactor for 1 min every hour.
Steve
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