Fleck 2510 Auto Backwash Centaur Carbon Filter 1.0 10×44 resin tank 1.0 cubic foot of centaur carbon 5 gpm service flow rate 4.5 gpm backwash flow rate Floor Space Required is 11x14x51 Shipping Weight is 90 lbs Centaur is a virgin activated carbon that does not rely on metal impregnates to provide catalytic activity. The adsorptive pore structure is similar to conventional activated carbon products, however, Centaur is manufactured by a patented process that results in modifying the electronic properties. It has 10 to 100 times more surface sites for electronic transfer and this provides its enhanced catalytic functionality. Centaur promotes a range of chemical reactions where conventional carbons are not effective. This product is especially suited for removal of Hydrogen Sulfide (rotten egg) odors.