I have been wanting to setup a aging tank for a while now. Up until now I have been either filling directly from the tap and treating the whole tank. Not the greatest with water from the tap at 8.2 and extremely hard. or batch treating with a 5 gal culligan. Taking out 10 or so gallons and then treating 5 gals at a time with wardleys ph 6.5 3 in 1 and filling the tank back up. Works well for now but when I go back to school I will no longer have the time, room, or amibition to do this. I have tried a couple different ideas for setting up an aging tank. I have a 20 gal rubbermade tub and a 2000 gph sump pump, I know this is way way to much for what I need but home depot had em on sale for $25. I would like to use carbon and peet to remove chlorine heavy metals and soften the water and lower the ph. Any suggestions or plans?