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Warning! N-G-W Tubing Is Offgassing


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Just a heads up for anyone using this tubing. It can destroy your grow. Contains Diisobutyl phthalate

If you care to read on, here you go.




There have been at least one or two here who have (had) unresolved problems.


Think one grew via NFT, would have to pump nute solution some how... where the heck was that inquire?

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I'm currently running coco DTW and after hand watering I automated my last grow with... you got it, n-g-w tubing. I didn't have it as bad as some folks, maybe cause I only had about 8 feet of it and excellent ventilation but yeah, my crop suffered a bit. Replaced with hydrofarm tubing. We'll see.

Thank goodness someone had the resources to track this down.

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ThanXX ShisKa U saved one of my friends.....at least 80% of his next......He had just lost 3 Grandads and couldn't figure out his problem using DWC buckets. I read last nite and passed on info 2Day and sure enough 80% of his lines R NGW. CRAZYYYY





Glad your friend got things fixed. :)



Would think these companies would not be so stupid......Bean counters should not be allowed to influence, just count and go back to yer cubby hole.

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this has ruined 2 straight crops right in front of my eyes please bump this every day people need to know i wouldve never figured this out


its in my grow journal, and in the help thread.


i will personally make sure that this info STAYS "current"


this is serious stuff. for real serious stuff. patients suffer because of things like this. caregivers suffer from wasted money AND a thrashing from patients as well.


its just not good at all.


check your tubes folks.

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I found some articles that claim N-G-W tubbing causes gassing. It suposedly put's out a chemical in the form of a gas. That makes your leaves curl and yellow. That ends in death and total loss of crop. I just bought 40 feet of this stuff. I only have one scrog so far that i use it on. I havent noticed anything yet.has anyone here heard of this or has a problem with it.I really dont feel like replacing the tubbing for nothing. how many of you are using it. They say it is the 1/2 inch black and clear blue that does it.so if you have some input i would love to here it.

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Guest finallyfree09

just wanna pop in again to say you probably just saved sublimeweed's headache.........................


and i know for a fact you saved me some seroius problems. thankx taj!! truly:



hey BG... as soon as i saw this thread i sent it to sublime. rite at the same time you did apparently! :lol: i've been over there and seen his ladies and couldn't figure out what was wrong. it really looked like a deficiency of sorts.


anyways, i just wanted to let you know that sublime and i both got a little chuckle out of our (you and i) timing. hehe

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Glad to see this thread got some legs to it. I'm sure there is at least one person that has this problem that looked right passed this thread. Also glad someone had the resources (money) to get this info. Very glad he didn't keep it to himself as some would do.

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i lost the other thread, so im starting a new one to keep bumped. this is a serious problem throughout the entire world right now. check your tubing. check where it came from.


if it says n-g-w on it, throw it away, it is both black and blue tubing:




Warning new off gassing product!!!!




So I have been experiencing a mysterious yellowing for about 10 months. Every thing that went into one of my 11 different rooms (some that had been going 5+ years) started to yellow and eventually die. My first instinct was my ph I checked my pens, they were not very far off but I calibrated and bought new probes anyways. That did nothing. Then we suspected the nutes, maybe we got a bad batch. I had bought 6 gallon jugs and filled all my 1 gal’s up off the same batch. Call the company run the batch numbers and they say they are 18 months old, So we went out bought new nutes and nothing changed. So after that I figured my favorite brand had fallen off and we decided to try another brand. We go buy $1000 worth of canna. And we thought possibly it could be something with our clones so we picked up a batch of clones from an LA club. Same thing new nutes new genetics same yellowing. So now I am scratching my head start making some calls visit a bunch of other rooms, and at least 20 in my immediate area have this same mystery problem. So I do some research find out we are all on the same water supply. I found 4 rooms on another water district doing bitching so I say BINGO, It must be the water. We go out and buy a 275 gallon tote and start buying water from this other district. A real pain in the donkey I might add we had to do 2-3 trips a week to meet our demands. Same problem. We start doing testing 1st water test, 2nd tissues sample, I have a horticulturist come and look at things. He suggests an Iron def. We get our tests back everything looks good. We do a tissue sample off a room that is doing good compare our results and everything is fine. Except my plants still look like bunny muffin. So I emailed my test results to my original nute company they pass it around the office and let everyone take a look at it. I get a call a couple of days later from them and he asks me if I have ever considered off gassing. What is crazy is the night before I found a thread on the hydro huts and was showing my partner how Identical it looked. So now we go to our rooms and start looking around at what it could possibly be. Like I said some rooms had been going in the same location with nothing changed in about 5 years. There is only 1 new product that we had replaced the ½ tube that connects all the buckets. I started to call around and every room that was having the problem had replaced there tube with the new stuff. The 4 rooms that were doing good were using old hose and was just washing it out. So being lazy saved theses guys who would of thought. I have been talking to the company that made the offending tube for 4 months and they do not wish to resolve this problem even though I have proof that the toxic chemical is in the tube. We have done GC/MS testing, LC/MS, testing and FT IR testing that show conclusively that the chemical Diisobutyl phthalate is in the tube. This is the same chemical that caused the problems with the hydro huts. If you are having a mysterious yellowing and are using NGW tube replace it immediately and please respond to this thread. I am going to be working on a class action against these guys. I have some of the worlds top experts on the matter willing to testify and do any research needed to win this case. The idiots printed there names on the tube it has n-g-w.com printed every foot, so it is easy to identify.



Here is a brief description of what the phthalate does to the plants.


The toxicity caused by a volatile constituent from certain samples of flexible polyvinyl chloride (PVC)

was due to dibutyl or diisobutyl phthalate (DBP or DIBP) plasticisers. It has caused serious financial

losses in the horticultural industry. The two phthalate esters have low volatilities, so any toxicity lasts

for many years. Radish (Raphanus sativus L. cv. Cherry Belle) seedlings, exposed to an air stream

containing 160-180 ng dm~3 of butyl phthalates developed chlorotic leaves within 3-4 d and died

within 12 d. Neither dioctyl nor diisodecyl phthalate (DOP nor DIDP) produced damage in the test

plants. Measurements of photosynthetic and respiratory gas exchange in intact shoots of affected

radishes showed that photosynthesis was severely inhibited whilst respiration was virtually

unaffected. Electron micrographs of sections from young leaves showed disruption of thylakoid

formation and granal stacking. In mature leaves, thylakoids and grana were well formed but

chloroplasts were swollen and the thylakoids were pushed towards the vacuolar side of the

chloroplast. Sensitivity to toxic phthalates varies between species; all members of the Crucifcrae tested

were susceptible, tomato less so, and lettuce and ryegrass were resistant. Toxicity of DIBP, from PVC

glazing strip, caused a reduction in crop value of £20000 per acre per year in commercially grown,

monocrop tomatoes.





The effects of phthalate esters on chlorophyll a2 fluorescence in radish plants (Raphanus sativus L. cv.

Cherry Belle) were examined Fluorescence yield was increased in those plants exposed to an aerial

concentration of 120 ng dm"3 dibutyl phthalate (DBP) at a rate of 3-0 dm3 min"1 for 13 d.

Comparison of fluorescence enhancement ratios and Fr^/F01 suggests that DBP inhibits photosynthesis

in radish plants at a site after QA. Both DBP and diisobutyl phthalate (DIBP) strongly

inhibited uncoupled (PS2 + PS1) electron transport rates in thylakoids isolated from spinach. At a

chlorophyll concentration of 10 /ig cm"3 the concentrations of DBP and DIBP exhibiting 50%

inhibition were 44 mmol m " 3 and 42 mmol m " 3 respectively. Basal electron transport rates were also

inhibited, with 87 mmol m"3 of DBP or DIBP producing 50% inhibition. Measurement of

photosystem 1 activity suggested that the main site of action of these phthalates was localized at a site

near the reducing side of photosystem 2.


ECA #10281


The analysis of the samples has been completed and the results are given below. The sample information is:

______________________________ ____________________ ________________

Customer Identification: PVT Tube

Sample #: 10281a

Date Received: 7-12-10

Test Requested: Identification and Quantification of Phthalate(s)

USP <851> FTIR with quantitative extraction.


Sample Results

PVT Tube

15.95% diisobutylphthalate

FTIR spectrum matches well with diisobutylphthalate library spectra and reference standard.




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