Matala Hakko Circle Air Diffuser, 8" Diameter OD-8 Nycon It is an excellent refill

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

Aquascape® Lake Bacteria help restore biological balance in large ponds and lakes

15 R270241 Filter Media

Carefully determine pond volume

Matala Hakko Circle Air Diffuser, 8" Diameter OD-8 Nycon It is an excellent refillThe 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).