Matala Hakko Circle Air Diffuser, 8" Diameter OD-8 Nycon Rather than using conventional beads

Rather than using conventional beads as its principle filter media

Measures 18"L x 16"W x 10

It is an excellent refill for all filter cartridges and can be used for all freshwater and saltwater aquariums

Helix Cold Temperature Beneficial Bacteria has over 1 billion colony forming units per gram

Ideal for cold water below 50°F

Matala Hakko Circle Air Diffuser, 8" Diameter OD-8 Nycon Rather than using conventional beadsThe Matala Hakko Air Hose Diffuser is an 8" diameter self weighted diffuser that produces medium sized bubbles. This low back pressure diffuser gives maximum air flow from the air pump. Can be connected to 3 8" diameter weighted hose and has three sized barb options. Note: We recommend at least one diffuser for every 20 to 25 liters of air volume when used with a diaphragm pump (to prevent excessive back pressure).