Clean Toilet with Drano Max Build-Up Remover
Clean Toilet with Drano Max Build-Up Remover

How to Fix a Slow-Running Toilet

You probably already know that Drano® products are effective and safe to use in sink drains and shower drains, but what about toilets? Here’s the 411, by the numbers.


One and only one Drano product

There is only one Drano® product recommended for use in slow-running toilets: Drano® Max Build-Up Remover. It contains microorganisms that break down organic matter in pipes that can slow water flow. (However, it will not open a completely clogged toilet. For that problem, see How to Unclog a Toilet.)

4 ounces over three days

Simply flush 4 ounces of Drano® Max Build-Up Remover down the toilet for three consecutive days. Do this before leaving for work or going to bed, as it’s best to avoid flushing your toilet for 6-8 hours after each treatment.

Reuse every four weeks

To help prevent toilet clogs in the future, you can safely use Drano® Max Build-Up Remover monthly. It’s a good idea to be prepared, and keep some on hand!