Audio Desk Record Cleaner

I top it off with distilled water alone on the theory that the cleaner concentrate is not supersensitive to the precise amount of distilled water in the tank.

Hessec,
Not to downgrade your fluid mixture at all, Pepsi admits that Aquafina is just filtered tap water.

Isochronism, yes, it is filtered, it is the filtering process that is important. When I was a grad student we made our own lab water with a very nice filter system. Started out with tap water. Could be toilet water for that matter as long as one filters it properly.

Look at the solids ppm content of aquafina. It is perfectly appropriate for this application. You will be inducing more filth onto your record as it passes through the air from the cleaner to the sleeve. I thought about using some audiophile approved reagent water and then I did the math...someday I may try it just for kicks.

Rfogel8 if the transducers are defective and the record was cleaned with just the rollers, I'm sure the record would look just as clean. Like I said usually with ultrasonic cleaners you can see some sort of bubble action.