Finding ultra-pure water locally...

The little I know and the information I have would suggest that there would indeed be a difference between the two products; my guess is that it would probably involve higher levels of ultrafiltration. Nerl themselves appear not to apply the "ultrapure" name to their reagent grade water.

That being said, I would expect the reagent grade to be very good and your point as to whether one could "hear" the difference between the reagent grade and the "Safe and Sure Ultra Pure" is well taken.

Threaders : The information that I have been able to verify indicates the Peak Battery Water sold @ Pep Boys Auto Shops @ $4.00 per Gal is the cheapest currently available alternative to Lab grade water sold nationally. According to information shaired with me by the Consumer Rep for Peak , the product has undergone multiable cleaning stages not noted on the container. While I personally do have other SP Water options my object is to locate other water products at the cheapest price. As for SP Water I believe L. Walker sells it by the Gal. I do not know the price but it should be higher than Peak.

the information I have would suggest that there would indeed be a difference between the two products; my guess is that it would probably involve higher levels of ultrafiltration. Nerl themselves appear not to apply the "ultrapure" name to their reagent grade water.

This makes sense. That Thermo Scientific is packaging Safe & Secure UltraPure as qty 6 1- pint bottles suggests this is water for special needs not requiring larger volumes and those needs are not so great that it is commonly saleable on-line.

As best I can tell, the description for both the 'simple' 9800-5 Reagent Grade Water and the S&SUP read identically, viz.: "ideal for reconstituting chemistry or coagulation products, preparing analytical standards, or rinsing delicate electrodes. Prepared at 18 megohm/cm specific resistance using reverse osmosis, mixed bed deionization, activated carbon filtration and final filtration to 0.2 micron, our water is essentially free from organic and inorganic particulate and soluble contaminants."

Fwiw, the MedicalMailOrder.com folks shipped the 44lb box in less than 24hrs, so that's a good sign. I didn't do the math but I'm gonna guess that at roughly $34 for 5 gallons, its still cheaper than Dasani. :-) And if its as good as the stuff Lloyd sends out then my wallet, my records and Ms. Loricraft will all be happy. I'll clean, listen and letcha know.

Jtimothya: From the description you posted above, I think you'll be very happy with the water you ordered and that it will every bit as good, if not better than the "ultrapure" being shipped by the various manufacturers of record cleaning products.

In looking at the description compared to a "Contaminant Removal Profile" on ultrapure as described by Pall Life Sciences, the company who provides the water purification equipment used in my wife's lab, the only stage that seems to be missing from Pall's ultrapure profile is a combination Ultrafiltration (UF) and UV photo-oxidation stage just prior to a second stage of deionization and the final .2 micron filtration. This is just a guess, but I would guess that the Nerl "Safe and Secure" ultrapure might be subject to this stage to qualify for its "ultrapure" status.

Good luck and keep us posted. I'm pretty sure you and Albert are going to be quite pleased with the results.

FYI, Lloyd Walker sells his UP Water for $44 for a half gallon jug.