how big is your room, a 512 cu. ft. room should have a 20lb. co2 tank last 1 - 2 weeks. i would get a secondary co2 testing kit such as this one (i will post) and make shur e your staying in the 1500 to 1800 range. it should only take six min. to get that ppm rating in a room the size i stated above.
All this info was what the local hydroponic store told me so i could be wrong. i am setting up co2 in a couple days~
good luck!
santacruz_organic Reviewed by santacruz_organic on . Co2 tank empty in 3 days.. First thing - I am running an auto disperse system. I set the ppm at 1800 and let the thing run. It was empty 3-4 days later. How long should a 20 lb bottle last in a sealed room? I figure it is more than 4 days???? Second thing - My Co2 monitor gives me a constant readout of current levels. I have read that ambient fresh air is around 300 ppm. My room with no enrichment was 1045 ppm this morn when I went in there!! It varies from 400+ppm to 800+ during the day????? Isn't this odd? I have a Rating: 5