We have a unit from The Filter Guys, and it's attached to a faucet. You can also have them attached to hosepipe faucets/laundry room faucets.
You can definitely attach them only when needed, if you set it up right. A unit will easily fit under the sink.
Here's a pic of ours (it came with full diagrams and labels on all the parts/tubes to help with setup)
You can definitely attach them only when needed, if you set it up right. A unit will easily fit under the sink.
Here's a pic of ours (it came with full diagrams and labels on all the parts/tubes to help with setup)