Loading ...Even when CO2 is purchased wholesale, the amount of bottled gas you would need would be astounding in a greenhouse application. Almost everyone in the greenhouse business burns natural gas or propane in tankless water heaters that are unvented into the space. Usually the hot water is just dumped. In most cities the CO2 level is about 350 PPM and gardeners turn it up to 1500 PPM and it makes a huge difference if the light and nutrients are there.
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