AMMOFREE (TECHNO CARBON) Absorbs Ammonia, Nitrite and Nitrate (1.5mg/g), Suitable for Fresh and Salt Water, Suitable for Tanks and Ponds, Does not absorb medication, Does not re-release ammonia after absorption. Recommended to be place close to filter, Improves the COLOURS in fish as stress is reduced (pollution in water),treats 100 litres of water and last 2-3 months, Does not need rinsing before introduction, will not cloud the water, All natural (natural carbonised material NH-X) Balls are not refillable, Absorption of Ammonia most effective after 24 hours
From http://www.vetproductsdirect.com.au/gbp ... AMF100.htm
which is also on http://www.aquariumproducts.com.au/cata ... 87&catID=9
Hope it helps