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HTG filters suck, phresh FTW. i also use ozone and sometimes generic ONA

as long as you aren't doing electrical work you aren't sure of, you're fine. Doing things like upgrading a breaker without running bigger gauge wire, running 15 amps through a 18 ga extension cord, chopping off grounding pins, etc are fire risks. Electric above the waist, water below the waist...

you want to fill the screen to about 70% full, flip to 12/12 and continue training halfway through the stretch. stop training and allow the stretch to finish. I would not weave. What size is your screen, how many plants, how old are the plants?

I read this whole thread last year and I know it was mentioned, and I tried using the thread search but couldnt find it... for those of you using an upper screen for additional support, what size are your holes? My primary screen is 24"x48" inside with 2"x2" holes. Should I make the upper with...

Yeah that certainly works. For me and probably many others, moving plants isnt an option (Hydro, back problems). Do you have pots on wheels? A number of companies make 3 wheel adjustable plant dollies. Another idea is to run your 1 ballast 24/7 with a flipbox connected to 2 lamps in their own...

http://www.ebay.com/itm/Indoor-Temperature-Controller-for-portable-heaters-air-conditioners-/221255836598?pt=LH_DefaultDomain_0&hash=item3383e023b6

if possible don't vent outside, vent into another room that your tent does not intake from. go to the dollar store and pick up a half dozen on those odor neutralizing beads (fresh linen scent,BEADS dont get the blocks). place them in the path of the exhaust. then go to lowes and go to the...

Hey rumple, nice guide. I just got done drying with this method this time around and I think it helped even things out a bit, especially since i've had some low humidity lately. Tonight my harvest will be dry enough to weigh and then its into gallon ball jars and cured with a hygrometer via...

OK, lets estimate how much concrete and gravel you need. Have a look at this thickened slab detail: http://www.drawings911.com/product_images/m/footingmono_12__52585.jpg The edges of your floor pad need to be 16”x16” for your 8” block. This is the footer. It needs to support the walls...

look into some training methods for your next grow, topping, LST, etc. so you can use your lights more efficiently.

honestly if i were building this i'd dig the hole, sloped correctly for safety, pour a 16x18 concrete pad, block up the walls with standard 8" block, tar the outside and french drain hooked up to your sump pump, for the ceiling, corrugated steel pan, rebar, concrete, 6" thick. I honestly wouldnt...

you should check out this show, its on netflix, it's called doomsday bunkers. this dude builds these steel boxes for people that think the world is gonna end tomorrow. It makes a lot of sense to build the box in a fabrication shop then just drop it in the hole cause its super strong... since you...

there are a lot more variables than how it holds together, when you open up a hole the soil is dynamic, it will change with rain and what not... without a soil test from an engineer i still recommend the standard... one and a half times the depth.

Now you are on the right page. The steepness of the slope is known as the angle of repose. In a perfect world, you would have a geotechnical engineer and a surveyor come in, shoot some points and dig a test pit or bore out a core sample. He or she would give you a soil report and specify the...

what is so alarming about this plan (or lack thereof) is that you spend so much time talking about sump pumps, IR detection and running your grow off of batteries than you do talking about how you're going to keep 12 feet of soil from caving in. Forgive me if you've already got this all figured...

this was mentioned in one of dude's several other threads on the same subject. sounds like he's planning on using wood and joint compound (lol), cause apparently concrete is "unnecessary 16x18x12 is a pretty big grave to dig yourself

What kind of lights you using? General rule of thumb is passive intake low to the ground to suck in cool air, active exhaust high near the ceiling to suck out hot air. 12x15 you gonna need active exhaust. I'd go with a 6" or better yet 8" inline fan depending on a lot of things... whether you...

I looked into it, it sound like you are talking about Lake Nyos in 1986. Heres an article: http://en.wikipedia.org/wiki/Lake_Nyos The problem is it doesnt say the concentration. Also I think you are a bit confused when it comes to smog. CO2 is just one of the constituents of smog. Ground-level...

just want to point out this is false, if this were true we'd be finding a lot more dead bodies in grow rooms... straight from wiki: CO2 is an asphyxiant gas and not classified as toxic or harmful in accordance with Globally Harmonized System of Classification and Labelling of Chemicals...

sure you can put it as close as you want. I wouldnt recommend it though. the hand test is a good rule of thumb but i can almost guarantee you'll have light bleaching late in the grow (regardless of canopy temps), which seems to slightly retard bud growth in the affected area. This is my...