My understanding is that WRV didn't add the two cartridge filters until the 2006 model year. They are mounted to the bulkhead centerline and behind the power cord reel. When viewing from the front of the coach, the left canister holds a sediment filter and the right one is the carbon filter. If you are going to use the housings to add chlorine, use the carbon housing as the carbon filter has a near infinite capaciry to remove chlorine - absent organics. Put the chlorine in the canister and then fill tank to desired level followed by the suggested run thru all faucets - hot and cold. I think the smell test is OK, providing your nose still works. If you really care about the water you drink, get an RO unit!!!!