Klaudio ultrasonic cleaner - Only using distilled water?


I'm still using only distilled water in my Klaudio ultrasonic cleaner (as it's the only sanctioned solvent for the Klaudio ultrasonic cleaner). Anyone else using something different (in the Klaudio machine specifically)? 
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I have been using reagent water. Perhaps unnecessary, Rush mentioned a fairly high grade of water he gets at Whole Foods for almost nothing (you bring your own container). I still use the reagent water to mix fluids (Hannl fluid is great on my Monks) and to do rinse steps. I pre clean all used vinyl on the Monks before it goes into the KL. If a new record (I buy some, not many) looks grotty out of the sleeve, it gets pre-cleaned as well before I plop into the KL.
The more interesting question --can one use some kind of surfactant in the KL? I don't think it is authorized, and am not suggesting that anyone do it, but the more I learn about US, the more I find that the commercial "audiophile" machines don't do it all--that DIY is probably the way to go- not just to save money, but theoretically, to optimize cleaning.