Co2 Tank Question

I have a Co2 tank I just picked up.

I am trying to get the PPM to about 1800 in two grow tents, both 4x4x7 which total 208 Cubic feet but I am having little success.

I am using the shitty plunge and glass seringe to measure the CO2. Everytime I have measured it comes out to 300 PPM which is just the ambient CO2 temp, so its like nothing is going on.

Currently with the Cubic feet meter chart I am running 15 min per hour, on about a setting of 2 during the light periods.

I have tubing set up around all of the plants at the top of the canpoy.


I have my carbon filter running 24/7 to keep the humidity and the smell down. I am not sure but I think by leaving that on it is sucking all the CO2 out of the room before it gets a chance to settle.

I am wondering if I should run my CO2 constantly during light hours since I have my carbon filter, or should I try to increase my settings to run it every 15 min.

LET ME KNOW WHAT YOU THINK CAN REALLY USE SOME HELP

have a timer turn off the filter/fans. then have another timer run the co2 15 mins at a time 3 or 4 times a day. thats what i do

subzerox said:

have a timer turn off the filter/fans. then have another timer run the co2 15 mins at a time 3 or 4 times a day. thats what i do

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Should I have time filter off just for that 15 min, and according to the chart it says 15 min per hour, should I ignore that?