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Anybody have an idea?

I'm making a carbon scrubber and I was wondering what the ammonium does. I can get with or without but I wanted to know if ammonium is good or bad because it is cheaper with it.

I'm very new to the forum and am building a 400w hps grow box from a clothes wardrobe about 4'x4'x6'. It is separated in the middle making two chambers and I was planning on moving it over to make flower side bigger. I just want to know if I could do a passive intake from the Veg chamber into...