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Licensed myself. First prob is you can't pull the system out without opening it up; releasing the freon. (though scrap yards are supposed to recover the freon when it first comes in) This leads to the next prob, how to recharge the system? Happen to have a vacuum pump? (they start @$200)...

Missing a piece. That 1000W is for the *bulb's* draw. It doesn't factor in the extra ~10% more for the ballast operation. The CFL watt rating (used not equiv) is the draw from the wall. (bulb and ballast included) SO 400W (true) of CFL uses less then 400W of HPS. CFL = 400 HPS = ~450W

Not really. The prills don't dissolve that way. Flushing can cause some burning. (check Mr. Fishy's posts)

Its a poor craftsman that blames his tools. If its SO bad, how come it did the best (in final yield) then a full FF and a promix with GH nutes? 3 plants all clones from the same mother? So many others have had great success with MG. You come in and say "its garbage" with absolutly no...

If using MG soil, no nutes. X-plant a week or two before flowering and go. pH'd water. A little molasses and maybe a *single* watering of a bloom boost around week 5.

5 inch? Odd. 4 & 6 are typical. I suggest getting biggest hood outlets. Its cheaper to change the duct/fan then a new hood. Plus if you get a smaller outlet on the hood and need more, the smaller becomes restrictive.

The epsom was for mag. my strained needed it. The leave it alone part. Have you read many posts here? SO many people over react. One tiny little spot and they freak getting very supplement there is. Let nature do its thing. And if you keep messing with it, you won't get that basic...

Typically electronic ballasts will run both MH & HPS. Read the specs. Call the MFG. If it won't work and you do it, I'd think you would hurt the ballast (and how it gets hurt, possibly blow a fuse/pop a breaker) Putting a HPS bulb in a MH magnetic/inductive ballast usually it just doesn't...

Use a couple few shower curtain rods. They screw to tighten. Just use them to press the film to the wall.

Baking soda is sodium bicarbonate, no? Noting comes to mind. (other then the pH stuff)

hot spots LOL! Yeah sure, its *possible* The crinkle in the foil creating a lens that has the focal point perfecting on the leaf. Yup possible. (not to mention most alum foil guys are using CLFs, not enough intensity by the time the light gets back to the plant.) No wrinkles, no 1 in a...

Electrical tape if you think its a prob.

I didn't think the CO2 from a brewery was vented. Thought it got stuck in the beer (hence the bubbles)

Depends on the room. But I'd suck through one and push through the other. aka: fan between the lights. But try it and see. Make it so you can easily change the config. Run it for a few hours, check glass temps, switch around and re-test. Different fans can/will produce different results...

Cal-Mag is a defined product made for plants. Epsom salt is a Kludge. Used for everything. (I used epsom salt, it worked for me, was cheap and can get anywhere. Always felt funny in Hydro shops. I bet better then 90% of their customers are growing pot. Big commercial greenhouses don't go...

pH down? Typically I need up. Most nutes I've used plummet the pH. (The almighty Fox Farms comes to mind)

Just a quick FYI. Nature's Necture (I think thats the brand) has the NPK all in individual nutes. You buy an N and a P and a K. (too much work for me balancing all that over the grow, but can be good for a boost/correction of a deficiency. I had my system down well, and is ultra simple: MG...

Males typically grow faster then the ladies

@90F the ice won't last. Do it right with a real AC or just grow enough in the winter to hold you over.

I don't plan on floating other threads. So if you want my help, this is where I'll be.