Fluval Underwater Filter U4 (130-240L) Dog Tins & Pouches Fluval Pre-Filter is designed to

Fluval Pre-Filter is designed to capture solid waste before they reach other media

Viscoelastic foam-flake filling

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Add 50ml of Tetra Pond AquaSafe to every 1000 litres (220 gallons) of water

Fluval Underwater Filter U4 (130-240L) Dog Tins & Pouches Fluval Pre-Filter is designed toFluval Underwater Filter U3 (90 150L) The Fluval U Series are underwater filters that offers outstanding 3 stage filtration, increased water movement and vital aeration. Fluval U Series internal filters are the perfect solution where external filtration is not possible. Complete and efficient 3 stage filtration, including BIOMAX biological filtering Ideal for fresh, marine and reptile environments. Now with new and improved design features!