If you need an under-the-sink water filter, the Aqua Polish #5 with Tap is a good low cost, compact and efficient micro water filter.
 
With single cartridge water filtration incorporating Structured Matrix™” technology for extremely fine Microfiltration and Broad Spectrum Adsorption/Molecular Sieving, it has been designed to remove a broad range of drinking water pollutants.
 
Supplied with:
Aqua Polish #5 Housing
Aqua Polish #5 Cartridge
Deluxe Water Filter Tap
Nipples
Tap Adapter
Pressure Limiting Valve (PLV)
Brass Ball Shut-off Valve
High Pressure Food Grade Water Filter Tube