We bought this unit to replace an identical unit that had worn out after 20 years. I expect this device to last 20 years. We have a second device that we also bought 20 years ago and it still works. The only difference is that filter media "strategyβ has changed over the last 20 years. It's a lot easier (and less messy since there are no loose charcoal pellets). Interestingly, you can buy a spare canister (I don't know why) and not a head (pump) block separately. The canister is cheap, the pump is not very good.
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