My last final question about winterization. I completed the process, and I am very confident that I did everything that it needs to be done to winterize my camper. Now, I received a flyer from Camping World, and their winterization price is $99.00 plus parts. But if you want your water filter winterize it will cost and additional $10.00. What kind of process they have to do to the water filter. In my case, I removed the water filter cartridge prior to winterize the camper. Do I need to do anything else? After completing the winterization process, my water filter empty clear canister was full of antifreeze. I took that antifreeze and emptied it into the traps. Do I need to do anything else in regards to the water filter/canister. Should I have to leave some antifreeze in that clear empty canister? Thanks.