Looks as if the BioMax has much more surface area then Matrix.
Eheim EHFISUBSTRAT with over 450 m2 per liter = 4842 sq. ft. of surface area per liter. Link a.
Seachem Matrix provides over 160,000 cm2 per liter = 170 sq. ft. of surface area per liter. Link b.
Hagan Biomax each ceramic ring contains at least 100 square feet of surface area x approx 66 rings per liter = 6600 sq. ft. of surface area per liter. Link c. Each 17.63 oz box contains approximately 100 ceramic cylinders - perfect for most mid-sized (approximately 1-1/2 L) media baskets. link d.
a. http://www.marinedepot.com/ps_ViewItem~idProduct~EH2509051.html
b. http://www.seachem.com/products/product_pages/Matrix.html
c. http://strictlypetsupplies.com/_015561113700.html
d. http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4136+15433&pcatid=15433
Eheim EHFISUBSTRAT with over 450 m2 per liter = 4842 sq. ft. of surface area per liter. Link a.
Seachem Matrix provides over 160,000 cm2 per liter = 170 sq. ft. of surface area per liter. Link b.
Hagan Biomax each ceramic ring contains at least 100 square feet of surface area x approx 66 rings per liter = 6600 sq. ft. of surface area per liter. Link c. Each 17.63 oz box contains approximately 100 ceramic cylinders - perfect for most mid-sized (approximately 1-1/2 L) media baskets. link d.
a. http://www.marinedepot.com/ps_ViewItem~idProduct~EH2509051.html
b. http://www.seachem.com/products/product_pages/Matrix.html
c. http://strictlypetsupplies.com/_015561113700.html
d. http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4136+15433&pcatid=15433