Interpet Aquarium Filter Aid No.3 100ml This 100ml bottle is sufficient to treat 500 Litres (110 gallons). However good your filtration system there are always minute particles present which find their way through the finest filter media. These particles irritate fish gill membranes, stunt plant growth by filtering out light and ruin the enjoyment of seeing your fish in their full glory. Filter aid acts rapidly, clumping the fine particles together so that the filter can remove them, producing crystal clear aquarium water. Contains: 100ml Filter Aid Handy pipettte Measuring cup Chart to calculate the required dosage Chart to aid diagnosis of alternative fish problems Price: £4.29 Quantity: