Air purifiers and water filter skepticism

[Guest guest]

Dr. Mercola is raving about this unit:

http://products.mercola.com/air-purifier/

but is this truly safe/effective? I bought one from another source a

while ago and now wonder if it's the best thing for me. I have

allergies to cats and dust and can't avoid either where I am, sadly. I

do feel better since using this product but wonder if this is good

long-term given that part of it uses ozone.

Water filters: ionizers are being hyped, the claim being that they

alter water's pH. Is there any validity to the health claims? I have

yet to read a controlled study that proves that this kind of water

does what the manufacturers claim in the human body. They claim that

this kind of water is used in Japan in hospitals.

Does anyone have links to conclusive controlled studies on what

chlorine in drinking water/showers/baths does to the human body? I

know an environmentalist who says drinking chlorine doesn't harm you

and nor does bathing in it because the amount in water is too low and

doesn't get absorbed into the bloodstream. I need good evidence that

it's harmful, if it indeed is.

Any hard science on the use of water filters is appreciated. I want

the truth about the benefit of using a filter with chlorinated city

water.