Tailored for Hozelock Bioforce systems: Custom-made for Hozelock Bioforce 3000, 6000, and 9000 Filtration Systems. Designed for specific Hozelock EASYCLEAR models: The EASYCLEAR 2000/3000 utilizes 1 foam filter, the EASYCLEAR 4000/6000 requires 2 foam filters, and the EASYCLEAR 9000 needs 3 foam filters.
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