My 270 has a Jabsco manual pump head. All I ever had before were porta potties. The previous owner added a fresh water tank for flushing which will be nice since I am a salt water boater. Should I treat that tank with anything? Bleach maybe? I have two other questions from you experience owners. One - best chemicals to use and how do I put them in? Just put them into the bowl I assume? Two - do I need the orange canister I have read about? I didn't see one on my boat but will look closer when I take off the shrink. Anything else I should know?