I'm very happy with my 3 part doser as have never had such amazing growth, mind you I have never used a Calcium reactor so I'm slightly bias. My draw rates aren't that large only 20ml per day of CA/ALK and 4ml of Mg which I will be doubling to compensate for all my livestock.
My fear with a Calcium reactor is a pressurized cylinder around corrosive salt water, panes of glass and $1000's of dollars with of livestock (My doser is much less explosion prone... at least I hope).
Levi
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