Winterizing - water filters

I have the original factory water filters on the boat for the wet bar and kitchen/fridge. To remove them, you just unscrew them 1/4 turn to the OFF position and pull down. My question is, when they're in the OFF position and cartridge is out, will the pink antifreeze flow through the filter base? ...or do I have to leave the filter cartridge in the fixture? I'm not at the boat to test and I'm trying to plan the winterizing next weekend ;-)

ThanksAttachment 53371Attachment 53372

I think the filter needs to be in place.