BIG BLUE 4.5 X 20 BONE CHAR – FOR FLUORIDE, ARSENIC REDUCTION. Bone Char is especially effective in removing radioactive particles. Filtering a range of toxic heavy metals such as fluoride, lead, and bromine. This filter fits any standard Big housing made for 4.5″ x 20″ cartridges. This 4.5″ x 20″ premium bone char refillable inline filter uses high grade filtration media for chlorine, taste, and odor treatment. Bone char has also been used in the removal of radioisotopes from water. This bone char carbon filter is most often used for filtering a range of toxic heavy metals including lead, aluminum, manganese, silver, as well as non metals including fluoride and bromine. This filter fits any standard housing made for 4.5″ x 20″ cartridges. Uncompromising Quality Water Systems. We have years of experience crafting our solutions for specific water sources in California. Our whole house water systems is designed to give you the best water quality from every faucet in your home. Setting ourselves apart from the competition, we use a three stage water system to clean, soften, and purify your water. A whole house filter, softener, and a reverse osmosis system. Track Page Views With. Auctiva’s FREE Counter.