Katadyne water for Wet Batteries?

[StuM]

> that will make 99% pure water from tap water

That will hardly do the job. 99% is still 10,000 ppm (parts per million) - we are talking about less than 100 ppm for batteries.

[sailorboy1]

you people have some interesting tap water, but I never like to to argue with internet experts

Deionization[edit]
Deionized water, also known as demineralized water / DM water[2] (DI water, DIW or de-ionized water), is water that has had its mineral ions removed, such as cations like sodium, calcium, iron, and copper, and anions such as chloride and sulfate. Deionization is a chemical process that uses specially manufactured ion-exchange resins which exchange hydrogen ion and hydroxide ion for dissolved minerals, which then recombine to form water. Because the majority of water impurities are dissolved salts, deionization produces a high purity water that is generally similar to distilled water, and this process is quick and without scale buildup. However, deionization does not significantly remove uncharged organic molecules, viruses or bacteria, except by incidental trapping in the resin

[StuM]

> Because the majority of water impurities are dissolved salts, deionization produces a high purity water that is generally similar to distilled water,

IOW, your "99% pure" was hugely understated; looks like you should have said 99.99%