3rd chamber on CO2 reactor?

[sphelps]

Gents, consider using the finest calcium carbonate media you can for your second or final chamber. This should increase the effectiveness of that final chamber. Also to combat lower pH associated with CA reactors dose calcium hydroxide as a suplement with a doser or in your top off water if applicable. Alternatively there are alkaline filter cartridges available for RO filters which add calcium and magnesium to your source water to bring pH back up.