Bioscape CO2 Reactor with solenoid


Bioscape CO2 Reactor with Solenoid



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Bioscape CO2 Reactor with Solenoid

The Bioscape CO2 generator produces CO2 when two readily available and low cost compounds, citric acid and sodium bicarbonate, are added to water in a controlled manner. This CO2 is then channeled through the supplied hosing to a diffuser of your choice (not included).

The kit consists of a pressure vessel, pressure reducer, contents gauge, needle valve, bubble counter and electronic solenoid.


You will need 200g of citric acid powder (C6H8O7) and sodium bicarbonate (NaHCO3) - not included.

Purchase Citric Acid and Sodium bicarbonate.

Before you start: Remove the round sticker from the bottom of the regulator. Screw the cylindrical filter containing desiccant (small silica gel balls) into the base of the


1. Place 200g of citric acid powder (C6H8O7) and sodium bicarbonate (NaHCO3) (not included) into the reaction cylinder. A paper funnel is supplied for this purpose. Ensure there is no powder in the thread of the bottle neck, if so wipe clean with a dry tissue or similar.

2. Tilt the reaction cylinder to around 45 degrees and then add 300mls of water. Do not pout the water into the cylinder in an upright position as the reaction will be too fast.

3. Promptly screw the regulator and the cylinder together, do not over tighten. Note that the reaction starts as soon as the water is added, failure to promptly screw the regulator in place will reduce gas production. There is no need to shake the bottle.

4. Screw the top of the bubble counter off and pour in a small amount of water, then replace the top. Push the bubble counter stem into the top of the fine adjustment valve - it will seal however is not a 'tight fit', some sideways movement is normal when it is in place.

5. If using the a solenoid, connect the male and female plugs together. The power plug for the solenoid should be plugged into the timer for the aquarium lights. The small indicator light will show when the solenoid is open.

6. If using the manual system the on/off valve can be placed 'in line' between the bubble counter and the reactor. This can be opened and closed as required ensuring the fine adjustment valve doesn't need constant adjustment.

7. The gas can be used when the pressure reaches 10kg/cm2, full pressure will be around 20kg/cm2. Adjust the bubble rate using the needle valve to the desired


Q: Why is the pressure lower than 20kg/cm2 after the initial reaction?

A: It will take around 24 hours to achieve this unless a lot of gas escaped when the regulator was screwed into place.

Q: The pressure is normal however there are no bubbles in the bubble counter.

A: Check there is water in the bubble counter.

Q: Why does gas continue after the solenoid shuts off?

A: It will take a little while for the pressure to reduce.

Q: Is there a safety valve in place?

A: Yes there is a valve on the regulator that will release gas if the pressure is too high. The SUS304 cylinder is designed to with stand pressure 10x what is produced by the reaction.

Q: Is it normal for the cylinder walls to get cold when the reaction occurs?

A: Yes, perfectly normal.

Q: How long will the gas last?

A: The amount of gas required is dependent on many factors - water chemistry, lighting, quantity and species of plants etc... As a guide at a rate of one bubble per second the charge will last 60 days or more approximately.

Q: How long is the warranty period?

A: The unit has a 12 month warranty covering manufacturing faults. Mechanical damage caused by force or misuse is not covered.


1. Release any remaining gas by opening the needle valve.

2. Remove the solenoid if fitted.

3. Remove the bubble counter by pushing down the collar at the base. Damage to this section by forcing the parts is not covered under warranty.

4. Unscrew the regulator, discard the waste liquid, rinse thoroughly and allow to dry, then refill.

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