Since the absence of a drain on the block, an unknown amount of water remains after flushing, I put the calculated amount of straight antifreeze in and then top off with distilled water. I my case my water now actually comes from the dehumidifier. When I still worked at the phone company we use to have a "still" to make water for the those big central office batteries. Now days that's too costly, so they have a special filter to remove minerals. I use to always have 5 gallons on hand. No not moonshine--water!
Paul
