....The fluval canister mod...
I was thinking connecting the intake and the out flow of a fluval canister with some soft vinyl and/or hard pvc tubing. The hard tubing will have three orifices for water in, CO2 in and effluent out. The effluent tube's opening can face the out flow. You can also use a venturi to draw the water into the reactor.
The old fluvals have three round media baskets that can hold quite a bit of aragonite. Just place a piece of foam on the bottom and top most positions.
The mod won't damage the filter so there's no loss.
Clint
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