why is ozone better than chlorine in water purification?
540014
Chlorine also produces HCl acid along with water but not Ozone.
125218
It's cost effective is likely the main reason, besides the significant public health concern. \n\nWhen chlorine treatment was introduced in the early 1900's diseases like typhoid, cholera, and dysentery were commonly carried in drinking water and chlorination effectively eliminated them. BUT:\nI quote:\n"... the July [1992]  issue of the American Journal of Public Health, researchers found that people who regularly drink tap water containing high levels of chlorinated hydrocarbons have a greater risk of developing bladder and rectal cancers than people who drink unchlorinated water.  The study estimates that about 9% of all bladder and 18% of all rectal cancer cases are associated with long-term consumption of these hydrocarbons.  This amounts to over 20,000 new cases each year!"\n\nEuropean water treatment has largely shifted to ozone and filtration, and they have found it works. Plus the chlorine residuals are about 10 times less than in US water. \n\nYour question is timely for me because my public water company just sent me a letter announcing that the drinking water was above regulatory limits for trihalomethanes-and this is caused by chlorination. Dibromochloromethane is associated with cancer risk of one per million at 0.6 micrograms per liter. That's about the same as 6 parts per billion. Not terrible odds at 1 per million, but I don't like that ppb since the smallest I can measure in the lab is probably about 3 parts per billion. In other words, it’s barely measurable.\n\nAnything like water that one consumes in large quantities daily for year after year deserves some attention. I am often the first to dismiss the latest crazy report about something else that will kill me, but with water it is statistically different. I see no choice but to filter drinking water. What else can you do?  \n\nFluoride? Well, you probably get a fair amount in your toothpaste. It’s normally kept around 1 ppm in drinking water so I doubt it is really that much of a problem. I suspect that using fluoride cuts down on the amount of chlorine needed so it may not always add to costs of treatment.
886949
water is essentially a better option.
478361
i am not sure but every pools i've visited use chlorine and people say it kills bacteria
1111764
The chlorine gas dissolves in the water to form the relatively weak acid hypochlorous acid\n\nCl2 + H2O --> HClO + HCl\n\nHypochlorous acid is a strong oxidizing agent though, and destroys the outer membranes/protein coat of almost all bacteria and viruses.  \n\nTake note that reaction must take place in dark.  Otherwise, there is formation of undesirable HCL (which raises the saltiness of the water and decreases pH significantly) according to reaction\n              \n 2HClO       (sunlight)--> 2HCl + O2\n\nThis is the weak point of chlorination: the fact that once the water is exposed to sunlight the antimicrobial effect of the HClO is diminished.   Also, chlorination may sometimes result in the formation of unwanted chlorohalogenic compounds which may be harmful to humans.  Other methods are used to avoid these weaknesses.   For more, visit\n\nhttp://en.wikipedia.org/wiki/Chlorination
631550
I am so glad you have educated yourself. Fluoride is poison! Most standard purifiers only remove the taste of fluoride, not actually the fluoride. If you really want to know that your water is safe check into reverse osmosis systems that you can install directly into your house, or have water delivered that is reverse osmosis. Most major metropolitan areas have options for home delivery water.
1044303
the only way I can see this, is to disolve ozone (O3) into water. Ozone is already used to disenfect chirgical tools
1050647
It depends on the levels. Very high is very bad for you. Chlorine is used to kill most germs in the pools. In Europe there are 2 pools, 1 which you swim in and the other to treat the water where the chloramines (cancer causing) are kept to a very very small level. In North America they use a different system which is much cheaper but uses higher levels of Ozone in their surge tank which gives a higher risk of cancer. Chlorine can cause also breathing problems and irritate your eyes. Also is can turn bleached hair green. On the plus side it can whiten your teeth. Flourine is similar to chlorine and is still in the tap water in North America due to the fact it gives you whiter, healthier teeth. But in Britain this was stopped some time ago due to the fact that it can cause health problems (still wonder why the Brits have bad teeth?). North America goes wholescale on all the water treatment processes from drinking water to swimming pools which is why costs are cheaper but health issues are sometimes skipped over. But the risk of swimming in un-chlorinated water is far greater! It is basically a stagnant lake otherwise. So chlorine can cause cancer on a small level but in North America it can be improved upon by implementing the decontaminating routine used in Germany where most chloramines are removed before people go swimming.
279572
Chlorine is used to sanitize the water. Sometimes you use chlorine tablets through automatic "dispensers" or chlorinators, sometimes you can use chlorine in granular or liquid form if you need it to work faster. \n\nOutdoors pools also use something called a Stabilizer because the sun's ultraviolet rays reduce the effectiveness of the chlorine so the stabilizer counteracts the rays' effect.\n\nFinally, some pools are treated with salt...a complex process that I don't understand involves lights and basically generates a sanitizer that acts as the chlorine would...
698226
One of the best and easy method of water filtration is using SAND. sand should be cleaned properly. it can be used to filter only organic matter not any chemical or bacteria.\n\nProcess:  just pass water through sand vertically.
683451
chlorine is much cheaper, baquacil is easier.
613040
Treat the chloride solution with ozone.
1116179
Use an inline ionizer instead of chlorine. It takes one cartridge a year an you mainly use chlorine only to shock the pool. \nYou may need a little chlorine with a lot of use but this system works great.
614560
Bleach has Chlorine.  Chlorine gas reacts swiftly with water to produce HCl, a very powerful acid.  When chlorine enters your nose or lungs, it reacts with the water there and you get a burning sensation that your body reacts violently to.  Your body is so sensitive to chlorine that your nose will detect the presence of chlorine faster and at lower levels than an electronic detector.
214694
The creation of stratospheric ozone is chiefly due to what is called the Chapman cycle which represents the production and subsequent annihilation of ozone by solar UV radiation . Destruction of ozone also results from catalytic reactions with hydrogen atoms, hydroxyl radicals (symbolised by HO-, derived from water H2O), nitric oxide (NO, from the exhausts of high-altitude aircraft), and so-called halogens, notably chlorine and bromine compounds. A catalytic reaction allows a single molecule of the triggering chemical to repeatedly react with the source chemical until its reservoir becomes depleted. However, there are complications, such as the inhibition of the destructive effects of both ClO (a compound of chlorine and oxygen) and NO2 (from NO) by their forming chlorine nitrate (ClONO2) instead. Chlorine nitrate does not destroy ozone, but it has the potential to destroy ozone since it is a reservoir of ClO.
628336
as opposed to polluted water?
626673
I think the water is the end result of a chemical reaction. Water is not combustible, and never will be. It is a life giving force, unlike fire. I found out that bleach and this other cleaning liquid turn into nerve gas when mixed together. I don't have a good explaination for why this happens. It just does.