Mejuana,
ABS (Acrylonitrile-Butadiene-Styrene) pipe or tubs will not leach any liquid material. These materials have been stringently tested by ASTM for approved use in underground plumbing installations. As well as use for containing chemicals. This pipe will outlast the Earth. I am not sure where you got your info from but I would not rely on that source if I were you.
ABS pipe and fittings were originally developed in the early 1950's for use in oil fields and the chemical industry.
According to the ABS institute,ABS pipe was shown to be unaffected by commonly used household chemicals including drain and bowl cleaners, such as; Tide detergent, Soilax cleanser, borax cleaners, Calgon water softener, Ammonia 5% solution, Renuzit spot remover,Drano, Liquid sani flush,Liquid plumber,Lysol bowl cleaner.
So if it can withstand these chemicals it can easily withstand any nutrients organic or chemical.
No disrespect just thought you should hear it from a licensed commercial plumber.