My first full grow was done without extractor fan and carbon filter. 400w hps, 4 x Northern Lights in dwc. They absolutely reeked. Ever had paranoia after smoking a spliff? Imagine feeling that every minute from mid flower to fully dry. Never again.
Too broke to buy a fan and filter, too dumb to abort the grow. I made a diy ozone generator that was well fierce. Every few hours, I'd run it until I could smell ozone, about 2 minutes. Too much ozone is dangerous to anything organic, including eyes, lungs and most importantly, thc.
It was enough to stop the odour escaping outside but inside the flat was so bad that I wouldn't answer the door.
A fan and carbon filter taped together makes a good air scrubber. You can use it to
almost eradicate the odour for the first grow (subject to size of fan/filter,) and fit it permanently for the 2nd grow.
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