CO2 Introduction Into Tank

hi guys
i've got a interesting point of discussion regarding introducing co2 into tank to assist plant growth.:blink1:

 

the large garbage bag contains human co2 breathed into the bag then released into the tank via the pump....

 

Good Idea. But i think the bag would take up alot of space in the end, and would require you to sit and blow up that bag constantly depending on how long it takes to deflate...In the long run, a pressurized set up will be more cost effective and time saving. I dont own a CO2 setup....but it makes sense to pay R1500 for a CO2 setup on initial costs, then after to pay R25 to refill your tank...