These foams are not Hozelock originals, however are manufactured in the UK using aquatic grade foam and cut to same size as Hozelock originals. We recommend replacing your filter fosm sponges at least once per year as over time the sponge will strach and shrink from cleaning etc.
70mm(7cm) Centre hole
Replacement filter foam for the Hozelock Bioforce 3000 pressure filter
1 foam required for Bioforce 3000
2 foam required for Bioforce 5500
3 foam required for Bioforce 8000