Havn't seen a video on 2019 30x winterization around. I get most of of the how too on draining heater tank and bypassing it. There is a shut off valve on my canister filter it seems.Is that just to replace filter while under pressure or to bypass it? Am i just better off removing the canister off and close shut off and winterizing around it or do I remove the water and filter in canister and install it back on? is that valve closed off on canister cutting off my flow of antifreeze to the entire plumbing supply? Thanks in advance.