Best Home Water Filters

I am looking into buying a water filter for kitchen tap. I gather you can put a system under the sink and run a separate tap.
Has anyone ever used such a system successfully? Or unsuccessfully for tht matter?
Is there a way I can try before I buy?
Thanks.
Water filtration systems come in three basic designs, ranked [...]

I have to do a project where i filter water fleas from a home made water filtration devise. I was wondering what household materials are good for filtering water.
depends on the micron level you are trying to filter out., at the pet store you can get filters from 1000 microns to 50 microns, the [...]