MarinePure High Performance Biofilter Media Block
MarinePure`s bio-media is the most technically advanced bio-media available today, designed to be a substrate for bio-filtration, specifically targeting ammonia and nitrite removal, minimizing denitrification. 
MarinePure is the perfect place for beneficial bacteria to flourish in order to remove harmful fish wastes, eliminating ammonia and lower nitrates.   
Thin Bio-Film Technology 
Combination of vast surface area and open/interconnected pores allow a thin bio-film to develop. This thin film allows bacteria to flourish because necessary nutrients are immediately available. With the open pores, old dead bio-film is easily flushed from the media and will not plug the media. Water flows through the media, not around as with other denser medias, thus utilizing the most surface area for beneficial bacterial growth. 
Features: 
Thin Bio-Film Technology™ 
For freshwater and marine aquaria 
Vast surface area 
Open porosity 
Designed for ammonia and nitrite removal 
MarinePure is inert and will not harm aquarium inhabitants 
Reduces tank maintenance 
Allows a higher bioload 
Can use a smaller filtration footprint 
Shape to fit 
Use in sumps, under gravel, canister filters, etc. 
Specifications:
One block per 100 gallons for nitrate control
Dimensions (LxWxH) = 8" x 8" x 4" 
Surface area = 23000 sqft