Heath, have you tested your aquarium charcoal setup yet? I followed your idea, and so far I'm not sure that I'm impressed with my results. Here is my own test:
Since my main interest is to remove the chlorine taste of AM or tablets, I first filled a 2-L Platy with tap water, then added the pills, waited 15-20 minutes to let them fully dissolve, and then I ran the water through the various filter modes:
(1) 0.1 micron Sawyer filter with 2' of tubing from the Platy, no Siltstopper/charcoal. I collected 8 oz. of this water in a glass.
(2) Sawyer with same hoses, but with the Siltstopper (filled with charcoal, and a custom steel screen to keep the pellets from escaping through the tube hole) placed just above the Sawyer .1 micron filter. I ran maybe 8 oz. of water through the system before collecting my 8 oz. sample, hoping to purge the filter and Siltstopper from step (1).
(3) As a control, I then attached a Frontier Pro filter, ran maybe 8 oz through to fully wet the day filter. Then I collected another 8 oz. sample.
(4) I dissolved one Micropur tablet into a 1-L Platy, to act as another control, for unfiltered water.
The treated water that was not run through a filter came out as you would expect--a mild taste of chlorine and the usual white floaties from the pill.
The water the Frontier Pro provided tasted just like my tap water (I'm on a well, with no chemicals involved--very pure artesian water). The FP seemed to remove all traces of the chloride from the pills.
I really couldn't taste a difference between the 2 Sawyer samples. Both had a slight taste of chlorine. I'm thinking that the granule size of the aquarium charcoal is too large to have much of an effect (they're little cylinders, 2.0 mm x 4.0 mm). I think I'll put some charcoal pellets into my coffee grinder and see if I can reduce the size. I'll toss any powder, as I think that might clog up the system somewhat. Then I'll repeat my test, and see if smaller bits of charcoal make a difference.
I'm desperate to learn from others how their results turned out. I'm also tempted to break open a spare FP to learn what size charcoal pieces they are using. Seems like I'm totally missing something here.