I did a review on ready made head designed for DIY CO2 system. Ordered at Lazada costing RM72.00 inc postage. Took about 10 days shipped from China. I received the goods nicely packed, and they even include an instruction to produce CO2 with citric acid and sodium bicarbonate. I did not use that formula as I'm used to yeast and sugar formula. This time I ordered brewers yeast instead of the normal bread yeast, as I was told that brewers yeast will last longer as they can withstand alcohol. After mixing everything I waited for reaction and non could be seen. At first I suspect the diffuser was set too deep which need higher pressure. So I raised it to 6" below surface and waited another day. Next day still no bubbles could be seen, and I suspect a leak. I remove the diffuser and and put the hose in water and I would see bubbles coming out. So the mixture is good, no leaks but why is there no bubbles? I'm kinda puzzled. 3rd day I decided to add more yeast and af