particles

I need some decent water purifier that can be fitted to the tap/facuet. Main purpose would be to remove dust particles and other visible particles. The tap water we get seem to have some dust particles or other particles. The primary purpose may be to use for bath and cleaning essential things...

Here's a fun science experiment: finely powder some rust and then blow it over the magstripe on your credit card and you can see the zeroes and ones encoded on it by the stripes where the magnetic forces attract the ferrous particles. For a bonus, Anaglyph tried this out on a woo-woo product...

How to get rid of the dust accumalating in the pc case ? Can silica gel absorb the suspended dust particles? If not , which chemical compound does this?