Water filtration system. Fits all PUR and PUR flavor options faucet systems and DELTA simply PUR faucets (Delta simply PUR has been certified to NSF standard 42 and NSF standard 53 by CSA). Our ultimate in filtration and a crisp, refreshing taste. Removes 99.9% microbial cysts, cryptosporidium and giardia. Independently certified NSF. NSF International, a nationally recognized, not-for-profit ...