I have a raised spa with a waterfall down into the pool. The waterfall spillover is a 1" thick 12" x 24" travertine piece that extends maybe 3/4 of an inch out beyond the tile in front of the waterfall. However, unless I really have the pump up high or am diverting most of the return into the spa, the waterfall tends to flow down along the wall rather than cascading in front of the wall. This weekend I experimented with putting a small piece of thin, flat rubber under the bottom outside lip of the travertine, sticking out slightly. It actually worked really well and had the waterfall flowing down nice, even at slower pump speeds. You couldn't even see the piece I stuck under there since the waterfall flowed in front of it. However, the adhesive tape that came on it only held on for 20 minutes or so, which is pretty much what I expected. (Just an experiment.) But now that I know I can manipulate the edge to make the waterfall perform better and not run down the tile wall, I'm curious if there are any more permanent solutions or products on the market designed for this type of thing. My searches here and on google didn't turn up much. I could certainly get a more durable adhesive to make my plastic/rubber concept last longer, but before I do, I wanted to see if anyone has another approach to consider.
Thanks in advance.