Kube is just a big carbon filter, like a cheap Brita on steroids..., it's just a big carbon block 1 stage filter.
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At least you get a real RO system, sure install is more involved, but it looks like even Grandma can do it.
Kube goes on existing faucet and doesn't slow tap down much so its still pretty normal. Who cares if it actually works when it's that convenient, I'm not drilling granite and putting in another tap.
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