Do countertop/portable reverse osmosis systems work?

I was ready to buy one until I read a review that said they don’t actually work, because more pressure is needed than a faucet can provide. My reason for wanting to go portable is that I am tired of paying to have people come over and do things (we’ve had multiple repairs all over the house), and I don’t think I could cut a good hole in my sink, myself, to accommodate the regular kind.

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