Seachem Matrix 100L Drum

• Large surface area: Seachem rates it at more than about 700 square metres per litre, and states one litre gives as much surface as 170 litres of plastic bio balls.
• Ammonia, nitrite and nitrate removal in the same filter: the pores support both nitrifying bacteria (which convert ammonia and nitrite) and denitrifying bacteria (which remove nitrate in low oxygen areas deep in the pores).
• Inert: it will not break down, will not directly change your pH, and does not need replacing.
• Rinseable: most of the bacteria live inside the pieces, so rinsing off debris does not strip the colony.
• No media bag should be needed for most uses, as the pieces are large enough on their own.

• Brand: Seachem
• Type: biological filter media
• Volume: 100 litres
• Piece size: about 10 mm
• Surface area: more than about 700 square metres per litre
• Dose: 250 mL for every 200 litres of water

Suitable for freshwater and marine systems with any wet or wet/dry filter; Seachem recommends a canister filter for best effect. Smaller tanks are better served by the smaller Seachem Matrix sizes, as this drum treats far more water than a single home aquarium needs.

Set up the flow through your filter in this order: mechanical media (sponge or floss) first, then chemical media, then Matrix. Use it with Seachem Stability to establish the biofilter faster. Seachem says nitrate improvement generally shows within a couple of weeks, though every system varies; if nitrate holds steady and you want it lower, add more Matrix. Pieces vary naturally in colour and size, from very light to quite dark, and this is normal.

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