|
Sodium hydroxide (caustic soda) won't harm drainage plumbing unless it's made from an amphoteric metal such as aluminium, copper, zinc or lead, which would be exceedingly rare and in most countries illegal. That's why old vertical drains (risers) were cast iron (typically 2-3 inch internal diameter), these days most in-building drainage plumbing is PVC.
Last edited by BetterRed; 04-23-2018 at 05:12 AM.
|