THIS THREAD APPLIES MAINLY TO THE FIRST VERSION OF THE L2 ALGAE SCRUBBER On the slot pipe, the "tabs" made out of spa flex & zip ties tend to break off easily. Replace them with a 2" to 3" section of airline hose with a zip-tie threaded through it, and tighten these down on the slot pipe (use a pliers to get them relatively tight). These do a much better job of blocking water from creeping along the pipe, and they are adjustable/movable. The above picture shows a 1" section of airline tubing. This is how the first batch of Revision 2 units were done. I now recommend cutting the tubing to length such that it wraps most of the way around the pipe, with just enough of a gap to allow the zip tie to be pulled down tight. So if you have a Rev 2 with the short hose, you can re-do it quickly and easily, all you need is 2 tip ties and about 6" of airline hose.