26oz tanks are too small .
You need a regulator , distribution hoses , and an acurate way to monitor the ppm in the room . I use a Sentinel CPPM-1 <- not cheap . $450.00 - $600.00

With a tank system you need a controller w/ whats called fuzzy logic programing . People w/ a burner don't .

I don't agree w/ everything the other poster claims .

Sealed room = a yes .

The need to exhaust the spent CO2 = a no . Plants use the carbon in CO2 and expell their own oxygen = they make their own fresh air supply = no need for intake / exhaust. I only exhaust my room when temps reach 92 degrees or more .

Only use CO2 in bloom / flowering . And shut it off all together 2 weeks before harvest or your finished product will lack smell and flavor for some reason that I really can't explain . Maybe Rhizome can go further w/ this .

Once dialed in you can exect 10-30% more yield and 1-2 weeks sooner finish times .

1500 ppm is optimum = a yes .

As far as CO2 tocxcicity . - 1% of a given atmosphere = 10,000 ppm.
1500 ppm = 1/15 of 1%.

Humans get headaches etc... at about 3.5% or 35,000 ppm . Our blood begins to turn to gas at 5% or 50,000 ppm and we begin to die. This is almost imposible to acomplish w/ a tank system , and would take a monsterous fuk up to take place w/ a L/P - Nat. gas burner. :stoned:

Peace
Crispi :jointsmile: