Maintain the filtration performance of your OPTI water system with this genuine 200-gallon alkaline replacement filter. It is designed for use with the OPTI Drop 3-gallon countertop dispenser and the OPTI Flex 3-gallon top-load dispenser jug. OPTI’s advanced ionic filtration technology reduces up to 99.99% of select contaminants, including lead, chlorine, PFAS, microplastics, and heavy metals. The filter also helps retain beneficial trace minerals while naturally enhancing water alkalinity up to pH 9.0. Each filter processes approximately 200 gallons of municipal tap water and typically lasts 3 to 4 months, depending on household consumption and incoming water quality. Its solid compressed activated coconut carbon provides increased contact between the water and filtration media during gravity filtration. Prime and rinse the replacement filter before installation according to the OPTI setup instructions. Replace the filter after approximately 200 gallons or when filtration performance noticeably declines. This listing includes one replacement filter only. The OPTI Drop, OPTI Flex, dispenser components, priming syringe, and testing kit are not included.