Custom-made to fit the Hozelock Bioforce 3000 / 5500 / 8000 Aquarium Filter. 1 x filter sponge for the Hozelock Bioforce 3000 filter. 2 x filter sponge for the Hozelock Bioforce 5500 filter. 3 x filter sponge for the Hozelock Bioforce 8000 filter.
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