Using Deionized vs. Hyper-filtered Water

Water is generally considered to be the “universal solvent” for its ability to dissolve a variety of different substances. For this reason, it's important to use the correct grade of water for different applications.

Deionized or distilled-quality (000 TDS) water can “attack” and dissolve certain metals, in particular, over time. This is widely known in water-quality and plumbing-related industries, and why plumbers advise against using copper piping to transport even reverse-osmosis (RO) water, not to mention distilled (or deionized) water, which is even more corrosive:

Water is called the universal solvent; it always "wants" to have substances dissolved in it. The less it has, the more aggressive it becomes in attacking things that can dissolve.
Water Quality Association (wqa.org)

Pure water is a relatively reactive chemical. When air is dissolved in extremely pure water, the resulting solution is extremely corrosive.
US Army Corps of Engineers (usace.army.mil)

The aggressiveness of this purified water towards the materials into which it comes in contact is a function of its purity. The better the purity, the more its aggressiveness. Piping after an RO unit should therefore always be non-metallic...Don't use copper piping after any (brand of) RO system. (Distilled water is more corrosive than RO water since the TDS is even lower.)
Plumbing Supply Group, LLC (plumbingsupply.com)

 

Due to the reactive nature of distilled-quality water and the presence of mixed metals and various materials used inside dental delivery units, we advise against the use of distilled water in delivery systems. Instead, we recommend using "hyper-filtered" water, which is best suited for filling dental bottles and ultrasonic cleaners, and for the final-rinse cycle of instrument washers. This hyper-filtered water is dispensed from VistaPure's lead-free faucet.

We recommend using the deionized (distilled-quality) water produced by the VistaPure system only for filling autoclaves, which are designed for use with water containing extremely low total dissolved solids (TDS). The deionized water is dispensed from VistaPure's autoclave wand.

These are general recommendations based on widely known and accepted water-chemistry facts. When in doubt, always follow manufacturers' recommendations.

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