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Simple question - Is it necessary to run ventilation during lights-out if there's no heat issue? I'm guessing no since photosynthesis isn't happening. If it makes a difference, I'm using a 400w cab with a 6 foot footprint, using a 170cfm fan (it's so loud!!).

Wouldn't putting it on the exhaust side make it push air out?

Cool, I never knew using my well water would be even close to viable due to the variables and minerals and shit. I'll check out that GH hardwater stuff. Thanks!

First time grower here, hempy-style. A couple basic questions...I've read the first ~100 pages but not the last 75 or so, so forgive me if these have been answered: 1. I get bottled spring water sent to my home from zephyrhills. Will the ph of this "spring water" (no mention of it being...