Title: Worst I have had
Review: Bought to replace Instapure filter. Not happy. Did not last 1/2 as long. Flow slows to a trickle within a month. Also extremely hard to open to replace cartridge, Used up 4 cartridges in 4 months. Returning to Instapure when final one expires (i.e. flow becomes drip. PUR obviously makes its profits on replacement cartridges.
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