My main concern is to do with pressure. Having never had a calcium reactor before, I wonder how much pressure comes out of it. If it is being fed into the bottom of the refugium, will that slow down the production of the reactor because of increased output pressure ? What about the low PH comment from a previous post. Is anyone feeding the outup of their calcium reactor to a refugium ? Is that a good idea ? I figure that any residual CO2 would be great for the macro algae.