This filter is manufactured according to the manufacturer's specifications. It's amazing how many counterfeit cartridges are out there. If in doubt, call PUR Customer Service at 1-800-787-5463 and ask them to verify Revain's Unique Product Identification Number (ASIN). The filter should be packaged in a GOLD foil pouch, not silver, and if you shake it you should hear the charcoal pellets rumble inside if it's new. If you're serious about drinking water, you don't want a cartridge that "works with polyurethane holders" or promises "effective removal of contaminants." I'm a retired engineer with water treatment experience, and good water means a lot to me I'm getting here in Louisville, Colorado comes straight from two springs of melted snow in the Rocky Mountains It's under the faucet If you count you'll realize you're not saving much by buying a cheap knock-off product. One of them filters 100 liters of water. It s cheap. I would also recommend taking the time to read your city's annual water treatment report. Some of the more recent things found in drinking water may surprise you.
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