Thats crap... Chlorophyll absorbs the rays of sunlight, and uses them in combination with water and carbon dioxide to generate glucose, the substance that fuels the growth of a plant... you cant just shoot Co2 into the water and expect to have the same results. Besides, during the night time plants actually reverse this process. It is at night time when they use the glucose they made during the day by photosynthesis. Oxygen now acts as the triggering mechanism... which means at night time they release Co2 back into the air. This is why ventilation is impotant to indoor gardens.

I'm sure oxygen is not used at all, and is given off as a waste product? Water + CO2 = glucose + oxygen
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The glucose is either used immediately for respiration/growth or stored as starch in the roots (which is insoluble.) Oxygen is just given off.

Nevertheless, I agree with you on the fact that roots cannot take in CO2; think plants, trees out door, their roots are under the ground, in soil, most of the time which cannot let gas pass through.

Plants do have a net release of carbon dioxide at night due to cellular
respiration. Both animals and plants undergo cellular respiration constantly.
However, in the light, plants produce much more oxygen via photosynthesis than
they consume in cellular respiration. However it's not enough to kill you.. they still release small amounts of carbon dioxide at night though.

I'm basically going to school for botany. Look up this one book called "Beginning Hydroponics" its by Richard E. Nicholls... or just look up any botany or plant biology books at the library... they have some really good information.

Read that co2 can be benefitial 4 da plant roots as well but kinda a hassle to hafta throw it in every few hrs. Gotta make it automated somhow. Anyways the good thing is i don't think u can overdo the dose.

i bought them 2. use them once a week.. and my plants are very healthy, is the possible that the roots absorb the co2 and brings it up the stem in to the leaves??

Dont know if anyone cares, but Dry ice= CO2. Drop a little in some water and it will make the dry ice (solid CO2) disolve.

Not a good idea to put in your res. goes without saying

First off, wouldnt you by doing this be creating carbonic acid... lowering the pH slightly? (may be bad for slightly acidic pH anyway).
Secondly, i feel like most of the CO2 will bubble into the grow area anyway thus increasing levels of gaseous CO2. But take whatever i say with a grain.

Thats what I was gonna say. A trip to Costco/BJs might be in order.

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