Waste of money in a small flowering room.
Maybe if you have a large bedroom
size ( say at least 3 metres x 3 metres) it could be worthwhile.
You will also need air conditioning and dehumidifier ( in most parts of Eastern Aus seaboard), to maximise benefits of Co2.
Be prepared for quarterly electricity bills of $3,000+ if you're not running rooftop solar.
A previous TSE member used CO2 in a sealed bedroom( average size)in QLD. His quarterly electricity bills were always $3000, which included constant running 24/7 air conditioning