If you are used to the ceramic disk based diffusers, this little thing will amaze you. It produces an extremely fine mist of bubbles, from a short distance the bubbles are not even visible! In that sense it's very effective indeed. However I will probably go back to using my old pollen glass diffuser, here's why: the ultra fine porosity of this diffuser requires a lot of gas pressure. On my 2.5 kilo CO2 tank I have to open the valve completely to get the mist going in the mornings. This isn't really a problem but I worry about all that pressure when I am away at work all day. If a check valve were to blow off for example my entire CO2 tank would empty in a matter of minutes. Also it's not really possible to finely tweak the bubble rate much under those circumstances. My advice, if you want to try this wonder out, is to ensure all your tubing and CO2 gadgets are capable and secure under maximum pressure.

So pleased with this. Does exactly what is says, so more effective to cover complete area of tank compared to other options. Hidden in a corner with good flow you don't see it, highly recommended for any plant fan! Stu, UKAPS member.