Hal,

It was designed in during construction of the pool so is plaster/gunite and is like an elevated ramp or column. Most of it acts like a wall that is just a couple of feet further towards the inside of the pool so that part doesn't affect the pool cleaner. However, if the pool cleaner starts wandering up the ramp itself (from near the deep end along the side), then it can get near the top and stop functioning at which point its "reverse" cycle usually gets it back into the main bulk pool water.

Most of the time, we have an opaque electric safety cover on the pool and the pool cleaner runs when we have the cover on so in that case I assume that if the pool cleaner starts up the ramp, that it stops at some point when there isn't room for it and then reverses at its next "backup" cycle. I rarely find the cleaner stranded on the ramp. Other than that, I don't find any issues with the ramp. We only have the ramp start halfway in the shallow end so that half of the shallow end is still full length so that long laps are still possible.

Richard