I have scoped my fresh water tank and it's clean and there is only 2 feet of pex from the tank to the pump. I have a hose within 3 inches of the pump going directly into a gallon of antifreeze. One gallon got all the fixtures. I got some red out of my outside shower but I'm going to pump a little more through there. When I'm done I'll blow all the antifreeze out of the lines and leave the fixtures open. I've done this for 40 years. You can't freeze something that's not there. If by chance there is a pocket of antifreeze somewhere it can't hurt anything
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