Highly Purified Water Suitable For Lead Acid Batteries. Deionized Water Is The Purest Form Of Water; But Is Also More Expensive. The Process Of Deionization Removes All Ionizable Particles (Organic And Inorganic) From Water Through Ion Exchange. Positively And Negatively Charged Ions Are Removed From The Water And Replaced With H+ And Oh Ions. When These Two Ions Are Combined; They Form H2 O Or Purified Water.