CO2 fertiliser system for the best feeding of fast and slow growing plants in freshwater aquariums from 20 to 400 l Professional water care: precise dosing with pressure reducer. Even release, effective distribution due to ceramic diffuser. Monitoring: bubble counter with backflow stop and CO2 pH test The conversion to a refillable cylinder system is possible by screwing on the adapter (JBL Adapt u-m, separately available) Storage cylinder T  V tested. No slipping of hose thanks to hose screw connection, check valve prevents water entering the cylinder Package contents: 500 g disposable CO2 cylinder, pressure reducer, 3 m hose, bubble counter with check valve, ceramic diffuser, permanent test with reagents, 1x plant fertiliser 100 ml, 1x daily fertiliser 10 m