There is now a possibility to install just 1 main faucet with both, clean and tap water function. Very compact design for small kitchens, solution with instant hot dispenser plumber in to the filter below as well through a t-joint.

Who is this for? People who cannot drill extra hole (rented unit), just need to enlarge current faucet hole to 35mm, which is invisible to landlord. Once you move out, just replace the faucet with the original one.

Also, great for someone who is planning to remodel his home, solid matte finish faucet with cold/hot/clean water.

Faucet is designed by Kaiser, Germany, but made in China... The only recommendation for clean water freaks like me is to flush it for 5 seconds or so every morning and when not used for long time.

More pics under spoiler.