My suction side "The Pool Cleaner" kept crawling up the side of the pool and when reaching the water-line would a make a sound that was scaring children and adults alike.
I tried adjusting the defuser fitting several ways with no luck.
Finally, I took a 7/32" drill bit and made a small hole in the back of the leaf canister towards the pump and below the water line. Voilą, it now climbs up the wall only 3/4 of the way.
The monster has been silenced!