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Filter Substrate is a biological filter media resembling rock like pieces. The surface of the substrate is covered in holes and figures giving it a very high surface area. Perfect for the colonisation of bacteria and ideal if you are making your own filter. The filter substrate is supplied in 10 bags.
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This table will help you with converting units from one type to another (for example 1 Imperial Gallon/min = 0.16 Cu. Feet/min, 4.55 Litres/min or 0.005 Cu. Metres/min) ...
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giving it a very high
surface area.
