[NH_Bulldog]

first mistake is dumping antifreeze into the tank. You could add 5-10 gallons before it got deep enough for the pump to suck it up and then after pumping a gallon out it would suck air. Typically you drain the tank, don’t add any antifreeze and then do a direct draw from the antifreeze bottle to the pump through the plumbing system. You typically use 2 gallons or less for the entire system including traps. Anything dumped into the fresh water tank is wasted and dewinterizing is a nightmare.