I actually ran the hose from it so it dumps the fresh water on the optical sensor. Never needs cleaned...I have the Osmolator 3155, no issues other than finding a placement for the optical sensor with some flow so it doesn't get gunked up which can stop it from activating. No sump here so floaties in the DT annoyed it a bit in my case. Havent touched it in months now (or cleaned it even).
Never going back to non-ATO again!