Ozone...I do not trust any advertising claims, but here is a university blurb.
http://www.water-research.net/ozone.htm
Short story is: various types of electrical activity (lightning, electric motor running) can produce ozone which is O3.
O3 is very unstable and quickly degrades into an O2 which is very stable, and an O1, which is highly reactive.
The O1 aggressively attaches to iron, sulphur, bacteria, and other water-borne items. This causes the chemicals to form particulates and fall to the bottom of the water tank, or causes the bacteria to die due to reactive cellular damage.
Do not drink ozonated water until it has rested for at least 30 minutes to ensure all O1's have reacted, which typically occurs in less than 15 minutes. Ozonated water should be transferred to a holding tank for at least 30 minutes before being consumed.
As a side note from other research, De-Ionized water has some uses, but drinking it will cause a slow health degradation. When consuming DI water is stopped, health will slowly return with no permanent affects.
When working on large contaminated water filtration systems a long time ago, water was pumped through a large "easy to clean out" sand filter, and then through a large charcoal filter. Activated (baked) charcoal granules are reactive, and will suck up a wide variety of organic and inorganic chemicals.
