Fluval Bio-Foam 406/407 Filter Block 2pcs

From the Fluval range. Designed for use with external fluval 07 series filters: 406/407. Effectively traps majority of waste & debris. Complex foam structure maintains consistent water flow & naturally promotes beneficial bacteria growth. For freshwater & saltwater use. Simple & easy to use, place foam into canister filter. Bio foam for 406/407. 2 pieces per pack, replace every 6 months.