4 32 site xl undercurrent systems in a 20X40 room

That's fine, and it wont "kill" your plants. But I see issues in your future when they are in heavy flower at 420 ppm. Looking good though dude.
 
bdt1981 said:
What issues you mean?
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Perhaps deficiencies. I personally haven't seen anyone flower at those levels. Especially in rdwc/UC system as these plants grow extremely fast in these systems. Obviously that doesnt mean people havent successfully flowered at those levels, just saying I havent seen it that low. At 750ppm my girls have no tip burn and can probabaly take more, but I'm happy with those levels at day 19 of flower.
 
Check it out i leave it at 420 last night and its 280 this morning. Is that normal? Im going to check it out that just seems like a huge drop oner a 13 hr time frame.
 
From what I've read, once you start seeing 50pt drops your plants are usually ready for a bump in ppm.

Most I've seen are flowering between 650-900 some as high as 11-1200. 450 seems low at this stage.

Your plants look great tho, nice job. That's a big room and lots of work to keep them all looking like that.
 
Just start slow. Up to 500ppm and see what happens tomorrow. You might find that instead of ppm dropping 140ppm over night it only dropped 60..or whatever. Then you could up to 550 and see what happens the next day, perhaps no drop at all at that point. At 750 my ppm stays there for about 3 or 4 days before I have to add back.
 
bdt1981 said:
Here is couple more pix. Everything going ok. Had the ph start dropping so i ddid a 3/4 change out. Which i been wanting to get the ppm up. Im a bit nervous so i left them at 420 mid week 3. And filled 50 gal top off with stronger. The ppm os still slowly dropping. Anything i do and the ppm continues to drop.
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What wall mounted fans are these? How do you like?

Awesome grow. MORE PICS:clap:
 
Howdy brother!

Thanks for the thread, always fun to read the energy and excitement in a newly legal environment. You mentioned Stacked Kush as a possible strain a while back...grew one a few years ago and she was bulletproof outdoors. Pulled about 20 oz's out of an 18 gallon pot, citrus soda/fuely skunk, solid potency. I reckon she'd be explosive in a set up like yours. Good luck man!

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With all that light 450ppm is VERY low.Remember a 2~300 ppm bump isnt huge,Id suggest you isolate a one plant system.You can test this way,,speed up the learning curve.
 
Ppm dropping still. Daily dose of about 200 ml a and b 100 coco cal and just started with 75 of mid boost. Got back to 420ppm. Its down to 350 now tho. I watch my digital meter and it eats a little constantly. The printouts show every minute or every 5 min avg.
 
In 20 minutes it went from 340 to 329ppm. Thats about how fast it goes constantly. When the ppm gets lower it actually slows down a bit.
 
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