JBL M603 CO2 Set

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Set up your perfect CO2 system for your planted aquarium using this JBL M603 CO2 Set, featuring all the connections and delivery units needed, as well as a 500g CO2 bottle to get you started.


  • Proflora m603 CO2 Set
    code: 6302210 Available (Usually delivered in 4 days)

Product Information

The JBL M603 CO2 Set

Carbon dioxide is a vital component for the photosynthetic process plants need to grow in health and vibrancy. As it is not produced naturally in the aquarium, it's essential to ensure the right level is available in your tank.

The M603 Set comes complete with everything needed to supply a source of CO2. 500g of CO2 is provided in a sturdy gas bottle, it is disseminated around the tank via the efficient Vario diffuser, which can be extended via extension kits (available separately).

The precise pressure reducer has a pre-set operating pressure, so accurate doses of CO2 can be administered. The whole system is designed to work as smoothly as possible, to provide all of the life within your aquarium with the best quality water.

This model also includes the JBL ProFlora digital control device to monitor the pH level in your tank. The unit also includes a night shut off valve which can be used with a timer (not included) to turn the CO2 off in the evening. A pH value of between 6.8 and 7.4 is ideal depending on the carbonate hardness (KH) of the water.

JBL offer the following advice so that you know how much CO2 to add. The carbonate hardness of the water and the pH value denotes how much CO2 is needed. Begin with a bubble in every other bend of the device and slowly increase the number as required, over several days. Full installation instructions are included. 

What's in the box?

  • 1 x Gas bottle with 500 g CO2.
  • 1 x Stand for gas bottle.
  • 1 x Precision pressure reducer.
  • 1 x CO2 vario diffusion system (aquarium height min. 30 cm).
  • 1 x Safety valve.
  • 1 x Connecting hose 4/6 mm.
  • 1 x Digital control device JBL PROFLORA pH-control (with built in night time cut off).
  • 1 x CO2 permanent test.

Product Specification

Product Handy Hints
JBL Proflora m603 CO2 Set Maintenance: The CO2-vario Diffusion System is made from grey-coloured makrolon, preventing virtually any algae settling in the bubble channel. Cleaning can be carried out when required using clean tap water. The device can be dismantled into its individual components by simply pulling the sections apart vertically. After cleaning, the sections can be simply put back together again. The catch on each module part should be correctly positioned to create a continuous channel for the bubbles. Changing bottles: When the bottle pressure begins to drop below 30 bar, the bottle should be disconnected and refilled or changed for a full bottle. The pressure in the bottle is not an indication of the amount of CO2 contained in the bottle. This can only be ascertained by weighing. The pressure indicated only begins to fall when the bottle is practically empty. Procedure: Close the bottle valve and wait until both pressure gauges indicate 0. Close the dosage valve on the pressure reducer. Unscrew the pressure reducer from the bottle and connect to a full bottle. Carefully open the bottle valve and re-set the number of bubbles required using the dosage valve on the pressure reducer.

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