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Discussion Starter · #1 ·
I will have a auto top-off / auto water change system for my 95g. Since it feeds directly from tap water, I will need to run it through carbon to remove the chlorine.
I already have a RO/DI unit. But I don't want to demineralise the water and all that, only remove chlorine. So I was thinking I could remove the membrane and DI resin, and only use carbon, and maybe the sediments.

But of course I have some questions about that!

Will the RO/DI unit work without the membrane? Will all water go throuth the "clean water" exit, or some will uselessly go through the "waste water" exit?

The store has cartridges of Granular and Extruded activated carbon. What's the difference? Should I use only one, or both, or two or three of the same?
 

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For what you want, skip the RO/DI unit unless you get a great price on it. Even then, I'd remove the RO unit.

You seem to only need a particulate filter and a carbon block module. While loose carbon should remove chlorine, a carbon block will.

By the way, you say tap water, but make no mention of chloramines. Most municipal systems in the US, no longer use only chlorine. The question about even carbon block filters removing chloramines is, I believe, an open or arguable issue.
 

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Discussion Starter · #3 ·
I already have the RO/DI unit, my 95g used to be a reef and that was pretty much necessary.

I don't know about chloramines, I'm not familiar with this chemical, I guess it's harmful to aquariums? I don't think it's used here, I live in Quebec, but still I'll check that. And if we do have chloramines here, well then I can simply use the whole RO/DI.
 
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