that’s good info for people doing DWC/RDWC. I'm growing in soil however and the air produce has to work its way to the surface, all the while leaving small pockets of air trapped in the soil.
As to airstones harboring bacteria, if you have bad bacteria on your res, your temps are to high and they will breed no matter what you use to oxygenate your water. and it has been tested and you can saturate water with air using airstones. I do agree though, that in some situations, the waterfall would be more effective as long as its not disturbing the roots too much. Small roots break easily.
QUOTE="drgreen, post: 835954, member: 15245"]can i just say and if u cant fidn it il post it,
ive done research and alot fo study into airstones and long story short,
airstones make aperfect breeding zone for bad bacteria,
airstones are not effective DO delivering systems, yes they add, but most the bubbles u see rise and dissipate.
we tested airstones vs fluming (simple sub-pumpat bottom makeing a jelly efect) and watt for watt the fluem created alot more oxygen, pics are on the thread on thct
basicly oxygen is only absorbed by water at the surface, bubble u cant see is what is needed, as the water surface breaks with a pump it pulls down forthe next low thus circulating the oxygen,
airstones tend to push up only so therefore altho show alot of bubbles they all rise and pop nothign is carried down and kept,
also another more effective methos is a waterfall teq cascase into the rez with the return pipe and there will be more ozygen thsan ever
trust me im a jackhere 13week from seed 600watt 24ounce and shit on ship dry,
200litre RDWC self made using only a waterfall return form a 500lph pump,
grown using npk minimum ratio of lucas forumla no addatives no booster,
just buds the size of your head and quality like ive never smoked from the street
search it and fidn it if i cant il psot it but atm i have mad my meds and i am skrewed sorry for my typing[/QUOTE]