What the heck happened to the price on these? They used to cost less than half. It's bad enough when you buy a filter set from your local store and they don't even have replacement filter cartridges, but now Dupont has almost tripled the price? Regular cartridges work just as well and are very cheap in comparison. I totally regret buying this Dupont system. It's not even that good quality, and now they're astronomically expensive.
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