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Hello: Have a 12x8x8 room, and would like to get your suggestion on that size of exhaust fan that I should employ for this application. I will be employing (4) 600w HPS lamps, and using a Carbon filter. My calculations are 12x8x8=768ft^3, but if I add 10% more volume per 600w lamp for a...

Hello All: My room is 12x8x8 (768 ft^3). I used the rule of thumb that the air should be replaced every 5 minutes to choose an exhaust fan, and as a result I got an 4" 177 cfm inline fan. What I failed to consider in the fancy calculation is that I have a carbon filter through which the air...

Hello: Got some fairly decent little bushes going in a couple different BP units, they have been veg'ing about 3 wks or so. As the title of the post states I'm seeing some droopy sad-ass looking leaves on the plants, oddly enough more so later on in the day, whereas earlier in the morning they...

Hi Bubbleheads: First off, I'm glad I found the site, you guys have a wealth of knowledge to share and for that I'm very thankful. My inquiry: 14 day old seedlings in BP unit, just got my pH meter today and found the H2O is 7.9!!! How can I safely lower to the prescribed 6.0? How much...