Thumbs up for ultrasonic record cleaning

@slaw 

It depends. First on the quality of distilled water (which is standard), and the sample of RO water (which is not).

If I were doing that measurement, I would try an instrument called a 'megger', which typically reads resistance with the help of a high voltage supply. Since I don't need one, I don't have one, and just bite the bullet and buy pharmacy distilled at $1.50 a gallon. Lazy? Yeah - but that's just me.

Another way to describe how much of an improvement this has made...

I have, waiting for me around 30 newly purchased lps.
I'm finding myself gravitating towards my older lps to hear them like I've never heard them before.This is on my (free day)!

How's that.........?

Is pharmacy distilled a higher standard than Walmart distilled?

@slaw 

I don't know. But I trust them to meet spec.

You may find this explanation of different purification processes helpful:  [url]http://www.emdmillipore.com/US/en/water-purification/learning-centers/tutorial/purification-techniqu...[/url] The source is a manufacturer of equipment used in labs and hospitals.
In my interview with the LOC, the preservation specialist suggested the D/I was sufficient for records, the main objective being to remove mineral content. 
I've been told you can buy reagent grade II at places like Cosco. 
The reagent grade 1 cannot be shipped to a residence. It's also more costly. I now only use it to mix fluids and for rinse steps on the Monks. I used standard supermarket distilled in the US machine.