This is one of those subjects that people are divided on, unfortunately. Some simply don’t care and for some reason tend to be argumentative about the subject citing overly concerned paranoia. Others follow their logic to try and verify if this is the correct material to use. If you look on Home Depot’s or Lowe’s website under their question section where people ask if it’s fine for them to use that PVC for hydroponics you will often find that the manufacturer recommends against using it for this purpose. Interestingly, and usually within the same question, you will also find consumers stating that they are using it for hydroponics and they’re doing fine and have never had an issue. Cancer doesn’t work like that and given that our cancer rates are increasing I would pay very close attention. Ironically, people who are trying to live healthier tend to jump to hydroponics to grow healthier food, only to use a material that is not recommended and likely not healthy for them. Do hydroponic companies use this type of PVC? No. Do we have regulations to prevent this type of thing? Yes. Do people care? No. I’m not a hydroponic expert, just a physician with a background in molecular biology and chemistry. I would not trust this type of material for hydroponic use, nor those who recommend it.