Using exhale in sealed tent, no vent till 1hr before to 1 hr after lights out, vent humidity. Fan on roof med speed and homebrew co2 15gal. Outside tent piped in through airhose. 2ks of sugar 3 packs yeast and big squirt of ketsup. Dont open tent for at least 1 hr after lights on, waste built up co2 if you do, defeats purpose. Bottled only work 3-5 days for 40 dollars the natttural one. This lasts 5 to 7 days, waterbottle filter tells you when dead. I believe it helps. The light they can take is suprising with added co2. Ive tried the bottles you add water too, 1ltr. Dont waste money, have 365 bag, not sure as homebrew runs tent not bag. Back up for homebrew change.