How much money can you earn as a plumber? Sulphuric acid drain cleaner litre. Where can i buy drain out bathroom? The product is a drain unblocker, which is an effective enzymatic treatment for breaking down organic waste and subsequently, unblocking the drains the product is readily biodegradable, non-flammable and entirely non-toxic but most importantly, the selected enzymes are friendly to the environment and are entirely ‘green’. We've got loyal clients.