Hiwi CO₂ Set Advanced Compact Soda

The CO₂ Set Advanced Compact Soda is the perfect choice for precise CO₂ regulation in a space-saving design, tailored for Sodastream cylinder users. It includes a Hiwi pressure regulator with integrated check valve, solenoid valve, and Sodastream adapter, a CO₂ high-pressure hose (PUR, crystal clear, 3 m), an Orb Checker Nano, the Aqua Rebell CO₂ indicator solution (20 mg/l, 250 ml), a bubble counter, and the AQUARIO Neo CO₂ Diffuser Original (Mini). This set is ideal for aquariums where compact setups are needed, combining flexibility, efficiency, and modern functionality in a single solution.

The high-quality pressure regulator by Hiwi is specially designed for the use on Sodastream Cylinders. It is operated to reduce the pressure inside the cylinder to a working pressure of approx. 1 to 3 bar. By combining the working pressure manometer and the cylinder pressure manometer you can regulate the CO₂ supply very precisely and you know at once when it is time to change the cylinder. The integrated fine needle valve allows a very precise regulation of the CO₂ supply for the aquarium. In addition, a check valve secures the pressure regulator from back running water. Moreover, this pressure regulator comes with a preinstalled solenoid valve for a night shut off, so that inhabitants of the tank, like e.g. fish and shrimps, can recover from the elevated CO₂ levels during the day.

The CO₂ high-pressure hose made of polyurethane is food-safe, absolutely crystal clear and without labeling. While PUR hoses are durable, they are not ideal for connecting to glassware. To ensure secure connections, the hose should be softened in very hot water before attaching it to fittings. Similarly, reheating the hose with hot water or a lighter before removing it from glassware reduces the risk of glass breakage.

The Aquasabi Bubble Counter is a valuable tool for monitoring CO₂ levels in aquariums. By counting bubbles over a set period, it allows for a rough estimation of CO₂ being supplied. The Bubble Counter has an integrated non-return valve whose main purpose is to prevent the backflow of aquarium water through the bubble counter into the technical system, such as the pressure reducer, especially when the supply pressure drops.
Using the bubble counter is simple and straightforward. The bubble counter is inserted into the system for optimized control of the amount of CO₂ supplied. The screw thread on the underside of the bubble counter is precisely manufactured to ensure a reliable connection with other components.

The CO₂ Drop Checker (Orb Checker Nano) allows for optimal monitoring of CO₂ levels in aquarium water. The Aqua Rebell CO₂ indicator solution included in the set changes colour based on the CO₂ concentration. Green indicates an ideal CO₂ level of 20 mg/l, blue signifies low CO₂, and yellow warns of excessive CO₂ concentrations.

The AQUARIO NEO CO₂ Diffuser Original is a compact acrylic CO₂ diffuser that efficiently atomises CO₂ through a specialised ceramic membrane, ensuring it dissolves effectively in water. It might be helpful to soak the diffuser in water for about 10 minutes before initial use to displace any trapped air. This could be particularly beneficial during the first 24 hours after installation to minimize the formation of larger bubbles at the bottom edge of the ceramic membrane. Alternatively, one could simply wait after connecting it to the CO₂ system, as the CO₂ will eventually displace the remaining air on its own.

• The connection for the CO₂ tubing is equipped with a metric thread (M6)
• The pressure regulator is designed for Sodastream Cylinders only
• No special adapter necessary
• Seal included
• With German instructions of use
• Suitable replacement as Set or only Hiwi seal
• The union nut must be tightened by hand! Tools must not be used at this point!
• 3-metre high-pressure hose for flexible installation
• Hose pressure-resistant up to 11 bar
• Hose bending radius: 20 mm
• Aquasabi Bubble Counter with integrated check valve to prevent backflow of water during pressure drops
• Aquario Neo CO₂ Diffuser Original available in sizes suitable for different aquariums
• Convenient Orb Checker for easy CO₂ monitoring
• Aqua Rebell CO₂ indicator solution with colour change at 20 mg/l CO₂
• Solenoid valve with safety plug and 1,5 m cable permanently installed

It is important to note that all components of the Hiwi pressure regulator have been glued together by the manufacturer. They cannot be unscrewed without causing damage. Removing the needle valve will void the warranty. An exception is the hose connection on the fine adjustment valve. This connection is not glued due to the fine thread, allowing for replacement of the hose connection if defective, rather than the entire fine adjustment valve.

Please use the pressure reducer only after reading the operating instructions, which are linked above.

• Make sure that you really start the pressure reducer with a CO₂ bottle.
• Turn the working pressure adjustment screw (operating instructions 4) counterclockwise.
• Close the fine needle valve (operating manual 5) by turning it clockwise. CAUTION: Tighten only slightly!
• Position the pressure reducer so that the pressure gauges are facing upwards.
• Fasten and tighten the pressure reducer to the CO₂ cylinder using the union nut (operating instructions 7). The union nut must be tightened by hand! Tools must not be used at this point!
• It is essential to ensure that the seal is correctly seated and that the sealing surfaces are clean. If the seal is is damaged or lost, please replace it.

If algae accumulate on PETG items, it is time to clean them. Cleaning is not difficult but should be done thoroughly. Afterwards, the PETG will shine like new again.

• Use regular household chlorine cleaner (hygienic cleaner) without added fragrances. Always follow the manufacturer’s safety instructions when handling chlorine bleach.
• Pour some chlorine cleaner into a container and mix it with 50% water. Ensure there is enough solution to completely submerge the PETG item.
• Immerse the PETG item in the solution for ½ to 1 hour (depending on the level of dirt).
• Remove the PETG item and rinse it thoroughly.
• At this point, all dirt should be gone, and the PETG item will shine like new again.
• Warning: Do not mix chlorine with vinegar! This creates a life-threatening hazard!

• 1x Hiwi Pressure regulator + solenoid valve + check valve + Adapter for Sodastream Zylinder
• 1x CO₂ high-pressure hose (PUR, crystal clear, 3 m)
• 1x Orb Checker - Nano
• 1x CO₂ Check - 20 mg/l (250 ml)
• 1x Bubble Counter
• 1x Neo CO₂ Diffuser - Original (Mini, Medium, or Large)