This is a small waterfall that I rebuilt yesterday. The original feature was built 12 years ago, and is a good example of the breakdown of soft sandstone. I found it really challenging to build up the falls with such little room to work. I used no soil at all under my liner. I also installed a small filter falls from Savio and did my best to hide it. Definitely built in less than ideal circumstances but it should last a long time. I came back to finish up some small touch up, and there was a 3' snake that had found a new home in the rocks. I was glad the homeowner warned me. Side note. I used 4 cans of waterfall foam on this tiny feature!