The water pressure from my sink is not enough to make the python work correctly, although thinking about it I had tried it on my previous 50 gal fw set up which only sat about 2 feet off the floor need to give it a try with the 72 which sits higher might work. Right now I siphon out a little less than 10 gallons into 2 5 gallon buckets. To refill I have a 20 gallon brute on a dolly that I move out to the tank and use a small pump that I have to pump the new water into the tank. After that I than move the brute into the kitchen to make addtional water. Once the water is made I move the brute back into the spare room so that I don't have brute containers sittting out in the open. I also have another 20 gallon brute container that I keep fresh rodi water in that I move back and forth from the kitchen to the spare room when I need to make more water. Right now since I don't have an ato I use a one gallon pitcher that it for the sw tank only to do my top off, right now my top off is only about a gallon a day or less so not much of a hassel.