RAW MATERIALS: 400g citric acid +400g baking soda + 600ml water = CO2 (Pressure45kg/cm) NOTE: For Safe Use: Do not exceed the recommended amount of raw materials and dont add other raw materials! Better to change the water in the bubble counter every week to prevent crystals from blocking the check valve or solenoid valve. Recommended to use with a CO2 drop checker (not included). All other details are listed in the manual, please read it carefully before installation. PACKAGE INCLUDED: 1 x generator cylinder 1 x CO2 regulator (with safety valve and needle valve) 1 x bubble counter with solenoid valve 1 x filter 1 x leadwire 1 x power adapter 1 x screwdriver 1 x 2m/6.6ft CO2 tubing 1 x diffuser 1 x 5mm suction cup 3 x 6mm suction cup 1 x check valve 2 x funnel 1 x base stand 1 x user manual - Small Body, Big PowerThickened cylinder, bottle body is made of thickened SUS304 stainless steel, gas storage capacity equals 4L cylinder! (The package does not contain raw materials) - Triple Stainless Steel Filter ElementMore durable than plastic filter element, Minimize the failure of solenoid valve. - 304 Stainless Steel The bottle, regulator and the filter element are all made of high quality 304 stainless steel, more safe and durable. - Convenient & Worriless John Guest Fit Design, 1 second quick plug high quality solenoid valve and bubble counter, low temperature and quiet. - Replaceable parts Every accessory can be replaced to ensure that your CO2 system will last a long time. Drying bead ASIN: B094D26QK1, solenoid valve ASIN B09ZT52XYN, Bubble counter ASIN: B08YN3FPJC, and multitudinous CO2 diffusers.,etc. One year warranty! 7*24hours After-sales guidance! - Use tipThe solenoid valve needs regular maintenance. When the solenoid valve cant control the CO2 flow, it needs to be cleaned before it can work normally. Please Email us for guide video: The solenoid valve needs regular maintenance