High-performance CO2 diffuser to be integrated into the outer filter hose.Highly effective CO2 enrichment for perfect plant growth in the aquarium, thanks to integration into the filter return hose... Cut the return water pipe of the external filter, wet the diffuser membrane, integrate the direct diffuser, connect the CO2 transport pipe, adjust the number of bubbles. A bubble counter is integrated to control the amount of CO2 added. A water check valve is also integrated to protect the technical equipment. Saves 20 e CO2 thanks to a particularly efficient membrane. Contents: 1 high performance direct CO2 diffuser ready to connect, wall bracket, suction cup and screw attachment