Kills bacteria so I will never have to treat the water once a month for bacteria because none is present. I put off writing you about the benefits of the Vortex Water Revitalizer, because every time I think I have seen everything it can do, something else pops up. I have the Vortex Water Revitalizer (copper 3/4 inch) that is hooked into my main water supply. I used compression fittings. That is the quickest way to install it without soldering and not having to worry about fire or scorched walls in a tight place. After the installation I let hot and cold water faucets run about 10 minutes to purge them of untreated water. I shut the gas off on the hot water tank and when that water in the tank ran cold I knew all the water had been flushed out. Then I took my first drink of Vortex Water Revitalizer water. I tasted the best water I have ever tasted since I have lived in this town (38 yrs.). The water comes from a river and has a chlorine taste plus the other chemicals that are put into it. Well, no chlorine or other chemical taste at all!!! The tap water has a high limestone content that plugs up water pipes and spots anything it comes into contact with when it dries. Since installing the Vortex Water Revitalizer, the spotting is almost totally gone and what remains can hardly be seen, and it wipes off with a dry rag like it was dust and not a water spot. The water tastes like it came from the purest water source in the world. I have a ph tester that is accurate to 2 decimal points (0.00). The water before the Vortex Water Revitalizer always tested between 8.70-8.80. This is alkaline; water that is 7.00 pH is neutral, not being alkaline or acidic. After installing the Vortex Water Revitalizer the water tests between 7.50 to 7.60; this is a lot closer to perfect than before. Mikael's comment: In the case of acidic water the Vortex Water Revitalizer is tending towards making the water more alkaline moving it towards 7-7.5 pH.] I also use less than 1/2 the amount of soap for washing clothes and they rinse completely, dry with less wrinkles and are softer when used. I have a whirlpool tub that left a water line in it every time it was used. I had to use a liquid chemical that smelled terrible to clean it as it is a plastic that would scratch with anything abrasive. Since the Vortex Water Revitalizer, I have not used the chemical or scrubbed it at all. I only rinse it out with a hand held shower and dry the flat surfaces with a sponge and it shines like a new penny. The manufacturer of the tub advises the owner to clean the piping in the tub with a bleach and automatic dishwasher soap solution that is circulated with the pump running to kill bacteria that live in the wet pipes and pump. This looks like little specks of black slime when it is washed from the inside of the pipes into the circulating water. This has to be done once a month to maintain sanitary conditions in the tub. I did this the day before the Vortex Water Revitalizer was installed and then did this a month later. The Vortex Water Revitalizer water had no black slime spots present; this proves to me that it will kill bacteria and that I will never have to treat the water once a month for bacteria because none is present. I even unscrewed the jets to feel if there was slime in the pipes and they were totally clean. Before the Vortex Water Revitalizer was installed when I did this. I could feel the slime in the pipes and it turned my fingers black. The sinks do not get a soapy scum on them anymore and when they need to be cleaned the cleaning interval is twice as long and very little effort is required to do this. I have a bird bath that, if not cleaned every second day, would grow green algae in it. As a test after the Vortex Water Revitalizer, I put clean water in it every second day, but did not scrub it out and it never did get an algae growth in it. You will use less soap to shower and wash your hair and it will rinse out quicker with the Vortex Water Revitalizer. The toilet stays cleaner longer with no mineral deposits in the bowl. I also noticed that the dark brown mineral stain in the holding tank is starting to leave. The shower head has cleaned itself of all deposits as have all of the aerators on the faucets which I used to soak in vinegar to clean them. I waited a year after reading your web site to purchase your product because I didn't believe any product could do so much, but I will say in all honesty that it did everything claimed and much more. Thank you for honest advertising and selling a great product. Dale C., Berea, Ohio U.S.A.