This cartridge comes shrink wrapped with no papers. Although it would be nice if it actually worked. I've been using it for a little over a week with satisfactory results to date. Today the water has a strong chemical taste. Tap water straight from an unfiltered faucet tastes good, so I know that filter is the problem. live and learn You get what you pay for. As of now, I'm using OMNI filters (filters I've been using for many years). This time I tried to save money.
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