Check the listing for details. SEACHEM SEAGEL Phosphate/Silicate/Organics Remover/Control 250 ML. Condition: New. Listed at 12.75 USD. SEACHEM SEAGEL 250 ML Auction is for ( 1 ) : SEACHEM SEAGEL 250 ML Removes phosphate, silicate, organics, metals, acids, and more50/50 blend of MatrixCarbon and PhosGuardMore convenient than two separate bags of media Description: SeaGel™ is a blend of MatrixCarbon™ and PhosGuard™. MatrixCarbon™ is an ultracapacity carbon for the removal of organic and color impurities. PhosGuard™ is a powerful remover of phosphate, silicate, toxic metals, and acids. Both components are bead shaped for optimum water flow characteristics and penetration. The components enhance each other and are ideal for reef and marine use. SeaGel™ may also be used in freshwater that is not phosphate buffered. Although MatrixCarbon™ has the lowest detectable leachable phosphate content of all major carbon brands tested, some phosphate is still released. Adding PhosGuard™ to the mix compensates for this. Both components are bead shaped for optimum water flow characteristics and penetration. The components enhance each other and are ideal for reef and marine use. Please feel free to contact me for International and combined auction shipping rates or with any questions or concerns that you may have about my products. Thank you !