Premium distilled water for ultrasonic record cleaner

Is LAST or Walker water any worse? I use Audio Intelligent, by the way, though not with ultrasonic machine. I have a mistrust for anything Mo-Fi so I don't even consider their water. 

Tomb- I use reagent grade water which is very expensive to buy at retail. I buy it in bulk. For a while, I was buying it from OpticsPlanet online, but it was more expensive each time I ordered it. A week or so ago, I checked their site, and it appears that they no longer carry it. I tracked down the supplier of the water, Fisher Scientific, which sells it under the Thermo brand. The price, with shipping, was about 2/3’s the cost of buying it from Optics. I use it for my KL, as a rinse when cleaning records on my Monks, and to make up cleaning fluids from concentrates like the Hannl, which is not sold in un-concentrated form here in the States. As to benefits, it is costly, but peace of mind- I don’t exactly know what processes some distilled, R/O, DI and other ’purified’ waters go though, particularly those sold in groceries or large retail outlets, the ’lab’ stuff has to meet certain standards, and goes through multiple purification steps. It is probably overkill, but since I usually do one thorough cleaning of a record and that’s it--for posterity--I want some assurance I’m leaving no residue on the vinyl surface. There are different grades of ’lab’ water, and a few sites that explain the processes to meet the various grades. To me, it is a relatively small cost given the sizable investment I have in records. To others, it may be a waste of money.
In my discussions with the preservation specialists at the LOC, they suggested DI water, which is not terribly expensive and meets the objective of not leaving mineral residue on the record. That interview is posted online.

I have the four step Walker fluids that I use those on my Loricraft which I use for only really soiled records if its a rare title.  Hate to use that $$ water in the Klaudio
not sure i will keep the Loricraft

i have been using drug store off the shelf distilled water
the tank takes about 2/3rds of a gallon

I’ll check out the Fisher Scientific Thermo and compare with the Audio Intellegent

doesn’t Albert Porter use some specific brand?

thanks

Whart
Is that the Nerl reagent grade water
or
reagent grade deionized water?

thanks