Don't take this as 100% but here's what i get from what i've read. The second chamber is used to bring the PH up and use up any CO2. As i passes through the media in the second chamber it will dissolve the media, use up any extra CO2 and raise the PH. I think that's haow it works,but i don't have one so can't say for sure. They are plumbed with the output(effluent) form the first chamber going to the bottom of the second and out the top.
Clinton
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