Ok, fine be scared of concrete. It is easy to leave alone and never ever worry about. My floor is concrete, and I don't fret.
PVC is absolutely nasty for humans to be around. Absolutely totally nasty.
Please read a little about it:
PVC: A major environmental health disaster
PVC is the worst plastic from an environmental health perspective, posing major hazards in its manufacture, product life and disposal.
Toxic Manufacturing Byproducts:
Dioxin (the most potent carcinogen known), ethylene dichloride and vinyl chloride are unavoidably created in production of PVC and can cause severe health problems, including:
Cancer
Endocrine disruption
Endometriosis
Neurological damage
Birth defects & impaired child development
Reproductive and immune system damage
I avoid Poly Vinyl Chlorate like the plague. I used copper pipes in my house..
just think about it.. maybe you don't care if you cannot see the fumes from the PVC... I have had issues with plastics and PVC fucking things up. remember all the grow tents that were made with bad plastic? Seasoned growers lost everything they had due to nastiness in plastics. I have lost a whole huge room of hydro due to contaminated plastic in buckets.
This is just stuff to think about. ...
As always, make up your own mind.
tommy