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I am switching from 2 part (BIonic) and going back to kalk dosing for alk and cal. It was for me at least the lowest cost, easiest to dose and most stable method on my past tanks. I had always dosed by adding kalk to my ATO water and evaporation would replenish alk and cal. However this method was not very consistent as evaporation would vary as would demand for cal and alk plus the need to clean the ATO res and pump 1-2 times a month gets old fast. I have a 4 channel doser I use for 2 part and was thinking I could mix the needed strength of kalk water and use a 1 gallon jug along with the doser to daily dose the need amount to maintain proper levels. This would allow for some flexibility as I can change the dose amount and strength of the kalk water while keeping my ATO res clean. Option 2 is a kalk reactor inline of the ATO. That would require the purchase of a reactor and an unwanted cost I would rather save for coral. Option 3 is my old method of kalk in the ATO res and just deal with cleaning and adjusting of kalk strength.