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 ass 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 shit. 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.




you should be compensated by NGW for all your investigative work. Thanks for the heads up!


Oh trust me I tried everything short of litigation so far. They basically told me to f@# off and they will not pay any of my bills or pull the tube off the market. I have a 3 page letter from their lawyer that basically calls me lire and threatens to sue me. I may post a copy of the letter with a few omited details like my name of course.


How do I identify phthalates in products?
There is no easy way to tell if a product has added phthalates. Phthalates can be identified on labels by a three or four letter acronym that defines their chemical structures. Labels rarely state “contains phthalates”.
There are a multitude of phthalate compounds. Which phthalate compound is added to a product depends in part on their molecular weight (MW). Phthalates with a higher molecular weight (HMW) are very slightly soluble in water; phthalates with a lower molecular weight (LMW) are reasonably soluble in water.
The 8 most widely used phthalate compounds and their metabolites are:
• BBP: butyl benzyl phthalate (LMW) *, **, ***
MBzP: mono benzyl phthalate
• DBP: di-n-butyl phthalate (LMW) *, **, ***
MBP: mono-n-butyl phthalate
MiBP: mono-isobutyl phthalate
Most common phthalate added to nail polish.
• DEHP: di-(2-ethylhexyl) phthalate (HMW) *, **, ***
MEHP: mono-(2-ethylhexyl) phthalate
Most widely-added phthalate to polyvinyl
chloride (PVC) to make products flexible.
• DEP: diethyl phthalate (LMW)
MEP: monoethyl phthalate
Most common phthalate added to personal
care products to enhance fragrance.
• DiDP: di-isodecyl phthalate (HMW) *, **, ***
• DiNP: di-isononyll phthalate (HMW) *, **, ***
Most common phthalate added as a softener
in the manufacture of toys and childcare products, such as bath toys, drinking straws,
and rubber ducks.
• DnHP: di-n- hexyl phthalate *
• DnOP: di-n-octyl phthalate (LMW) **, ***
* Listed in California’s Proposition 65 as a reproductive and developmental toxicant.
** Listed in California’s AB1108 (Ma and Huffman). The bill, if passed, will ban use in the manufacture of any toy or childcare article intended for use by a child under three years of age.
*** European Union banned as a phthalate softener in the manufacture of toys and childcare articles.
Read Labels to avoid phthalates.
The most common products using phthalate compounds are:
PVC Products
Phthalates are frequently added to PVC (vinyl) products to soften and make more flexible. If a plastic product is flexible, it probably contains phthalates unless the label specifically says it does not.
Personal Care Products
Phthalates are often added to personal care products, such as nail polish, perfumes, deodorants, hair gels, shampoos, soaps, hair sprays, and body lotions, to help lubricate other substances in the formula and to carry fragrances. Phthalates must be listed among the ingredients on product labels, unless they are added as a part of the “fragrance.” Under current law, they can then simply be labeled “fragrance,” even though they may make up 20% or more of the product.
Many companies have voluntarily removed phthalates from their products. A company will usually label its product “phthalate-free.” If unsure, call the company. If you can’t get information from the manufacturer, look for alternatives.
How can I recognize plastic toys and
containers containing phthalates?
All plastics are not the same. One easy way to recognize plastic toys, clothing, bottles, food and beverage storage containers, and/or food wrap that may contain phthalate compounds is to look for the number 3 inside the universal recycling symbol usually molded into the plastic on the bottom of the product.
Avoid products with the number 3 within the arrows and the letters “V” or “PVC” below the arrows.
Choose products with the numbers 1,2, 4 and 5 within the arrows. Many companies use phthalate-free substances such as polypropylene (PP), recycling code 5, to manufacture plastic products.

Guest 18340

I think everyone will agree that this is sticky worthy.
Thank you U.G.U, you may have single handedly saved countless grows:ying::ying:



Just so everyone knows how to make recovery as fast as possible. 1st remove every last bit of tube 2nd reduce light it is phytotoxic so light reacts and causes the burn. Either move the plants out from direct light or put a piece of window screen over the lens of the hood to cut the light output. 3rd is foliar feed I did a 300ppm of my base nutes a couple times a week. 4th cut added co2 and just use air your plants cannot benifit from co2 when they are in this condition. 5th if you have a carbon filter turn it on the carbon traps any molecules floating around. 6th wouldn't be a bad idea to do a res change it is a low molecular wieght phthalate so it is soluble in water according to some research I found last night.


pretty sure ngw is also sunlight supply? if so you gotta fight on your hands- craig h. is gnarly, not down for the cause at all and has deeeeeep pockets. goodluck homie..


Just Call me Urkle!!
Good looking U.G.U! That's fucked up shit to have to deal with sorry you've had so much trouble with your grows over this cuz that's a lot of money down the tubes literally. I will stick with my Hydrofarm tubing since I haven't had any problems in the 3.5months I've been using it. Major props for the thread I may have bought that shit if I couldn't get my usual if I needed to so glad I caught this thread... Sue them bastards especially Sunlight Supply

Guest 18340

So they change suppliers (that they've been buying tubing from for 3 years without issue with the product!) based on a single unsubstantiated claim by some unknown group who calls themselves The B.T. collective? I can smell the B.S. thru my computer screen.
They simply do not want to own up to it because they may get the shit sued out of them.
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Well-known member
I just built stands for my 4x4 flood tables out of ABS plastic from home depot. Off gassing worries the shit out of me. I am going to look for that little 3 on there for sure! Good info!


so what tubing is safe to use??? i dont have a hydro shop within driving distance


i think i may have this issue. all my leaves are yellowing from the bottom up and there is no nitrogen deficiency in regards to my reservoir mix. There are no other signs of deficiencies on my plants. Just leaves yellowing and crumbling from 1 week in. My hoses are blue and came with cap ebb gro bucket extensions. Does anyone have a idea how to distinguish between good & bad hoses?
Is this phthalate poisoning???

Is this phthalate poisoning???

For the last year I haven't been able to shake various leaf symptoms and other plant health issues despite tinkering with every friggin' variable I could think of and then some. I had started to think it was some virus for lack of other ideas. The plant pictures in the "Warning new off gassing product!!!!" thread look more like mine than any I've seen so far.

To anyone who knows, U.G.U and those who've had this, is this not it?:

P.S. Almost forgot to add that they get these symptoms just under HID lights, while under florescents they will seem fine and show little or no symptoms, regardless of temperature. I was saying to a friend the other day it's as if my plants had become allergic to bright light??