If you want to filter water at home, you’ve got three options: A pitcher that takes up as much room in your fridge as a large watermelon, a bulbous faucet attachment that looks ridiculous, or an under-sink system that filters your tap water before it comes out of your sink.

That third option is the most most unobtrusive, and also the most expensive, though maybe not by as much as you think. This highly rated iSpring 5-stage filter is down to $158 on Amazon, one of the best prices we’ve ever seen.