DuraFlo? water filter replacements for the AquaBrick? are proven to remove 99.9999% of Bacteria, such as E-Coli | 99.99% of Virus | 99.99% of Parasites such as Cryptosporidium and Giardia. Each filter purifies up to 700 gallons. Works with all countertop, gravity-fed & candlestick water filter systems. Use the DuraFlo? Water Filter Replacement in your AquaBrick? System to effectively purify water while camping, in case of emergency or in your home ? everyday.