this didn't go the first time. Help!! I have 100 fresh water tank in the MH (that what I was told when they put it in) I have poured 4 gal of MH anti freeze and the pump want pick it upI was told that I might need 20 or more before the pump will work. I was also told that there is a device that connect to the fresh water connection and you can use your air compressor to blow out the water. Has anyone heard of this and if so where can I get one on the devices to blow out the water lines in the MH.