JBL ProFlora u504 is a low-cost and modern CO2-system for aquaria from approximately 20 up to 400 litres content. The JBL ProFlora u504 set is ready to use and comes with all neccessary parts for the easy and more reliably operation. JBL ProFlora u504 is a CO2-system for disposable CO2-cylinders (u-system).
- Andy M. wrote about JBL ProFlora u504 CO2 Complete System in 2018:
Great CO˛ unit, only made better by using an in-line diffuser (Which Aquaristik also sell).
For smaller tanks, the adjustment knob may be a little sensitive, but it works perfect once you get it set right.
There are more expensive JBL kits that come with gauges, but with the disposable cylinders being so cheap, just keep a spare cylinder handy to change over when it runs out and you wont miss not having a gauge.
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- David W. wrote about JBL ProFlora u504 CO2 Complete System in April 2019:
How many bubbles a minute are required for this system I have 130 Litre tank
Aquaristikshop.com: The quantitiy of the bubbles depends on the required CO2 content of your tank (General hardness). Please use the CO2 table in the Manual and the permanent test. Please start with approx. 15 bubbles a minute.