Very easy to install. They are designed for 11 months but we usually only get around 4-6 as we use water to make formula for our baby. The first filter we bought we got 9 months before the baby. It filters water well, but note that the flow drops off fairly quickly after you've used it. Ordered twice, it's an OEM filter so not much to say. The price fluctuates a lot, so it's a good idea to keep an eye on price drops to get the best deal.
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