Watts Premier WP-PLUS-KIT RO-Pure Push Button Replacement Filter Kit RO PURE PLUS WATER FILTER REPLACEMENT KIT: This 531160 Four Pack of Replacement Filters is designed for use with Watts Premier's RO Pure Plus and Zero Pure Plus (531417) or Zero Pure Plus (531517) Reverse Osmosis Systems and is compatible with Watts Premier's RO Pure (531411, 531407). Save money by purchasing all the Filters in one kit together rather than individually. NOTE: This kit will only work with the RO Pure and Pure Plus line of Reverse Osmosis Systems. These filters will NOT fit the Watts 1/4 turn Kwik Change Reverse Osmosis System. RO FILTER KIT CONTENTS: When it is time to change all the filters in your Watts Premier RO Pure Plus this 4-Pack filter kit fits your needs pefectly. Containing one - Five Micron Sediment Filter (105311), one - Five Micron Carbon Pre-Filter (105351), one - 50 GPD Membrane (105331), and one - One Micron VOC (Volatile Organic Compound) Carbon Post-Filter (105381). RO FILTER PERFORMANCE: The Sediment Pre-Filter reduces dirt, silt and rust which affect the taste and appearance of your water. The Carbon Pre-Filter reduces chlorine taste and odors, also conditions the water before it is treated by the reverse osmosis membrane. The 50 GPD Membrane reduces TDS and other contaminants like Chromium, Arsenic, Copper, Lead and Cysts. The VOC Carbon Post-Filter reduces chemicals like MTBE's, Atrazine, Benzene, 2,4-D,Lindane and others from your drinking water. EASY FILTER MAINTENANCE: Changing filters is easy with the unique push-button assembly allowing for one-step filter changes that don't require you to shut off your water source. In order to maintain your system in its top performance it is recommended to change out both the Sediment and Carbon Pre-filters every 6 months, the VOC Carbon Filter replaced once a year, and the membrane to be replaced every 2 to 5 years. This will ensure you have crystal clear, high quality and great tasting water.