How Long to Flush Drano with Hot Water?

  • A clogged or slow running drain can be a nuisance to deal with. You know the pain of clogged pipes and toilets; sinks prone to gathering hair (like shower drain and bathroom sink), and drains that can’t do but fill themselves with stinky food rests and other types of gunk (like kitchen drains).  
  • These issues are the cause product inventors came up with a chemical liquid solution called Drano Max Build Up Remover and other related drain cleaning chemicals. These anti clog liquid chemicals in a bottle put an end to slowly draining sinks and unpleasant clogs in our houses and workplaces. 
  • The idea is to act on a clog using Drano before you contact a plumber. Drano product will safely dissolve the clog and clear out the way where the water runs down. So you won’t need a plumber and won’t have to invest in a plunger to repair your plumbing anymore! Simply pour the product and wait 15-30 minutes before flushing it with water.

What is Drano?

Drano Liquid Clog Remover is among the most popular, reliable, and low-cost solutions to deal with a clogged pipe system that can cause a sink drain to clog. 

We also refer to these kinds of chemical products as Liquid Plumbers. Their goal is to bring your pipes back to their proper, undisturbed functioning. 

Drano comes in various shapes and sizes. 

We’ve got, for example:

  1. Drano Max Build Up Remover,
  2. Drano Max Gel,
  3. Drano Kitchen Granules, and
  4. Drano Dual-Force Foamer Clog Remover, and a few others!

Important: The strongest Drano product is the thick bleach formula of Drano Max Gel Clog Remover. It has the power to cut right through standing water, remove hair, soap scum, and other gunk.

Drano product is made of:

  • aluminum, 
  • salt, 
  • bleach, 
  • sodium nitrate, and 
  • lye (sodium hydroxide);

All you have to do to unclog safely your

  • bathroom sink and its drains, 
  • kitchen drains, and 
  • other drains like laundry sinks

is carefully following the instructions given by a manufacturer. 

Tip: After you cleared up your metal pipes of clogged drains with Drano Max Gel Clog Remover, use Drano Max Build Up Remover to prevent clogs from forming again. The formula of this product contains natural enzymes and bacteria. It won’t open clogs but will keep drains them running smoothly and prevent clogs.

Instructions to use Drano

Drano manufacturer claims we can use these products safely with plastic or metal pipes if we follow the label directions.

Let’s see below how to use Drano liquid to unclog your drain and other appliances.


For starters, you should know that Drano Max Gel Clog Remover isn’t appropriate for toilets. 

You can unclog your toilet with another product, called Drano Max Build-Up Remover, recommended for slow running toilets.

Pour four ounces of the product down the toilet for over three consecutive days. 

Apply Drano overnight or before you go to work. 

Make sure not to flush with hot water your toilet for 6-8 hours after each treatment.

Wait 6 to 8 hours before running warm water down treated drains or flushing treated toilets.

Repeat the entire process using Drano every four weeks. 

Use Drano

If you deal with clogged or slow-running drains, slowly pour half of the bottle (the size of 32 oz.) over a drain. 

For extremely slow-running drains or complete clogs, pour in the entire content of the bottle (32 oz.)


What are the instructions for flushing the product with water after placing the liquid in our plumbing?

After you applied the product, wait and let it work for 15 minutes. For tough problems allow 30 minutes for the entire process.

You should already have unclogged your kitchen sink, bathroom sink, shower, or clogged bathtub.

Now flush it with hot water. 

Important: It should be hot water but not boiling. 

Wait a few minutes (15 minutes are too many, but let’s say 5) after you finish to flush with hot water. 

Your job here is done when you see that the sink is not clogged anymore and the water doesn’t run slowly like it used to!

Can Drano be dangerous?

Using Drano products is safe if done wisely. 

Yet, this liquid comes with a list of dangers for both our plumbing and well-being. 

Here’s are the threats we need to be aware of:

  1. Could damage existing plumbing as the combination of dissolving proteins, hot temperature, and bubbles could be problematic for pipes to withstand. It can make metal pipes corrode or crack, or soften and break PVC plumbing;
  1. It can harm your skin, eyes, and lungs because its purpose is to dissolve organic tissues. Coming into contact with your bare skin, eyes, or mouth can cause rashes or burns.
  1. Ingredients that Drano contains can be detrimental to residential and water environments. Liquid waste will make its way into the sewage system, rivers, streams, and the ocean. It can cause plants and wildlife to suffer, contaminating food and water supplies.
  1. Drano can harm septic systems because they kill all bacteria, the good ones included. Typically, the “good guys” aid in the decomposition and break down the sewage in the septic tank. It means that using a bottle of this chemical cleaner for clogged drains can cause even more significant blockages than we had before we had dealt with an in-house clog.
  1. One extremely important reason to rethink using Drano is the harm it could cause to kids and pets. These creatures—not being able to read cautionary labels—are susceptible to accidental poisoning by household chemicals. 

Important: Wash the product off immediately after use. Keep your hands away from your face during and after the process. Keep Drano away from children and pets. Keep the phone numbers for local and national poison control hotlines in case of accidental spillage. 

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Frequently Asked Questions

Drano is caustic, so it can corrode and damage the pipes if it stays inside for too long. The same happens with any chemical drain cleaner left unflushed in the pipe.
If you don't want to invest in the menu of chemical products, make your own drain cleaner solution. Pour one cup of baking soda, two cups of vinegar, and a half-gallon of hot water into the toilet. You can add dish soap to help dissolve some obstructions. Allow the solution to sit overnight and then flush the toilet in the morning.
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