Description
2 Boxes Of Professional Filter Bio Rings Media for canister filters, refugium & sump filters, substrate or mechanical filters! Sintered quartz, 16 OZ (453 grams). Super-Porus quartz material provides superior biological filtration with added surface area for beneficial bacteria growth. Long-Lasting durable and reusable. Unique shape promotes consistent water flow while trapping large debris. Bio-Rings media should be used as a middle stage of filtration. Replenish a quarter to half of the Bio Ri
