[Carbon Water Filters] The bb9-2 carbon blocks are made by sintering at high temperature using porous PE and active carbon , which provides high precision flow control and deep filtration to remove 99% of chlorine.[Ultra-Efficient Filtration] The high-quality coconut shell has passed the NSF42 safety test and certification as the raw material. Further, the lead free and free material filter shell, odor, color, chlorine, detergents, VOCs, heavy metals, carcinogens from your drinking water for an ultra-safe drinking experience.[Hassle Free Installation & Compatibility] The precision interface design with the washer and butterfly nut, provides for a tight fitting without an any leaks, to match perfectly with the brand. The filter pack is a for Travel, Big, Royal, , Light, Crown Series, , , King, Big Series, , Super Sterasyl and ATC super sterasyl filter, W9361122, W9361123.[Effective & Economical ] We recommend to replace the countertop purification gravity per 6000 gallons, subject to your home water conditions. Further installing, we request you to rinse the filter interior with tap water until the water is clean, for a better performance.Compatible with Stainless Steel CountertopHigh-efficiency FiltrationEasy to InstallEconomical and Effective Handwork bb9-2 water filter carbon blocksRemove 99% of the chlorineColour:blackMaterial:composite materialPackage Contents:4 x water filterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.