I wouldn't say I notice yellowing without carbon, but I do notice an improvement in water quality if I put in new carbon. I'm not sure how long the effect lasts though. It's not really that long, maybe a couple of days tops.
However I would say that it's probably useless to just have carbon passively - you need to drive flow through it. Ie., even having it in a baffle isn't probably good enough because water will just flow around it instead of through it. It has to be in a filter, either a phosban reactor or an aquaclear or a cannister filter.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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