Nikken Aqua Pour 1 Ceramic Pre-Filter, 1364, Replacement for Gravity Water Filter Purifier System 1360, PiMag GRAVITY FILTRATION: Remove solid impurities from tap water, the impurity can be a drying agent or an undesired side product or leftover reactant. Charcoal particles are very fine, and suction filtration may cause the charcoal to pass through the filter paper into the filtrate, this minimizes the problem. RATED CAPACITY: Rated flow service is at least 2 years or 2,113 gallons (8,000 liters), whichever comes first*. It is also a good idea to clean off the pre-filters to keep them in good working order. REPLACEMENT: Your product manual includes the recommended intervals for inspection (where applicable) and replacement. This may need to be performed less or more frequently, depending on operating conditions. Once a year or 6 months depending on the usage is recommended. COMPATIBILITY: This Nikken #1364, Aqua Pour Replacement Gravity Micro Sponge Pre-Filter is the correct filter for the older Nikken Aqua pour Gravity Water System #1360. INCLUDES: (1) Gravity Ceramic Pre-Filter