Anyone have or have info regarding a water puifier and or filtration system that is plumbed into the kitchen sink on a seperate faucet? I'm looking. For a really good unit that will filter/purify against bacteria, giardia, crypto, VOC, possibly viruses, etc. Maybe with two filters and a UV light. It's for an apartment, so space is a consideration. Budget is flexible, but not unlimited. Google is yielding mostly manufacturers' sites. Kitchen installations seller is suggesting Aqusana AQ 4601 unit. I will get to the library to check out Consumer Reports, but your input would be appreciated.