It's sooooooo nice to have the extra day off. I did 3 on, 1 off for a while, since it didn't matter what days I had off, and that way I never wasted any of the batch from the Pureflow. When I needed a set day off later on, we switched to 3-1, 2-1, and did slightly longer runs on the 2 day part. I used 25 L those days instead of 20 L on the 3 day part. I wasn't wasting as much fluid that way, and the extra 10 L cleaning keep my labs right where I wanted them. What schedule are you going to try?