Purchase this item and get 
High performance direct diffuser for CO2.
Key Features:
β’Β For an economical and direct plant fertilisation: CO2 diffuser for external filters.
β’Β Easy to install: connect to hose of external filter.
β’Β Exact dosing: integrated bubble counter, no water backflow thanks to backflow stop.
β’Β 20% CO2 saving due to an especially effective diaphragm.
