Not Compatible - Replacement Filters only for Purewell K8001/K8006/K8010 Purification Elements or PW-FH/ PW-FH-CF/ PW-FH-FT Gravity Water Filter System. Not compatible with other brands and other purewell series filtration systems. 6-Stage Filtration - This filter adopts a composite filter technology, can effectively minimize a broad array of contaminants. It utilizes a 6-stage filtration process, including a pre-filter mesh, PP cotton membrane, activated carbon, KDF, silver ions and a 0.01μm hollow fiber UF membrane, to reduce chlorine and intercept rust, sediment, organic matter and heavy metals. One more filter stage, one more guarantee. Precision Filtration - Boasting a filter pore size of just 0.01 microns, this filter efficiently sieves out 99.99% of minuscule materials from the water, while other brands offer only a 0.2 microns filter pore size. Smaller filter pore size equates to enhanced filtration accuracy. Durable and Replaceable - The pair of K8001 filters provides up to 6000 gallons of drinkable water, with each filter element serving up to 3000 gallons (lifespan may vary depending on water quality). For optimal performance, it's recommended to replace the filter elements every 6 months. Note - These purification elements DO NOT lower TDS value. Replacement Filters for Purewell Upgraded PW-FH/PW-FH-CF/PW-FH-FT Gravity Water Filter System