Compatible with Biorb Bio ring Filter Version 2 Gravel Convertor Upgrade Kit
5 x Compatible With Biorb Filter Service Kit and 2 x Compatible Biorb Air Stones. Bio ring 15 litre Compatible with Biorb Gravel Converter, Service Kit, Air Stone. FILTER FOAMS 5 x COMPATIBLE WITH BIORB ANTI ALGAE FILTER SERVICE KIT REFILL.