Mike: how often are you replacing the filter and pads on the AD? I cleaned the filter in lab water at 100 records and replaced the distilled water fluid at that time. I'm only up to about 160 or so cleanings on the AD.
with my first AD which I used without any trouble for a little over 2 years, I experimented with various approaches and came up with my method. I likely cleaned 1500+ records with it. this was right when I had purchased a good sized collection of classical Lps.
--only use a cap full of the specified cleaning agent. this is enough to aid drying and provide for some detergent for cleaning, yet it never foams. any more than a cap full and foaming seems to be a problem from time to time.
--I have a drawer underneath my table upon which the AD sits. I place 70 new Lp sleeves in this drawer. I replace the water and clean the filter when this drawer is empty. when I replace the filter and clean the filter after I drain the dirty water into the sink, I add about a quart of distilled water and slosh it around good and then drain that out so I make sure I get as much foreign particles out of the unit as I can.
---every 3 or 4 times I empty the drawer I also remove the brushes from the chamber and clean them thoroughly underneath the faucet. I then rinse them with distilled water. I also fill the water and do a couple of cycles with clean distilled water and then drain that out. so the whole system gets a good cleaning.
I did buy a new set of brushes and filters but I only replaced them once. and I don't know that I needed to even do that.