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How to Unblock Your Toilet Using Caustic Soda

How to Unblock Your Toilet Using Caustic Soda?

Caustic soda is one of the most effective drain cleaners available. Caustic soda can unblock toilet pipes and drains clogged in your home. In addition, plumbers often use it to clear stubborn clogs as it is both effective and affordable.

Caustic soda has a high pH level making it perfect for unblocking toilets. However, caustic soda is highly reactive and dangerous if not handled correctly.

Before you use caustic soda to unblock your toilet, you should check out our tips on how to unblock your toilet.

Article Summary
Title: How to Unblock Your Toilet Using Caustic Soda?
Overview: This article provides a guide on using caustic soda to unblock toilet pipes and drains. It highlights the effectiveness of caustic soda and the precautions required when handling this highly reactive chemical. The article emphasizes the importance of identifying the blocked area and offers tips for working safely with caustic soda, including wearing protective gear and ensuring proper ventilation. It also outlines the preparation of tools and materials needed and the step-by-step process of making a caustic soda solution. The article explains how to pour the solution down the toilet bowl, the chemical reaction involved, and the need for multiple applications in stubborn cases. It concludes with instructions for cleaning up and handling caustic soda splashes on the skin. The article emphasizes caution and safety when using caustic soda to unblock toilets.

Caustic Soda is a Strong Alkali

Caustic soda or sodium hydroxide (NaOH) is an alkali found in many products, including detergents and drain cleaners. It’s known for its powerful properties and ability to dissolve fat and grease deposits. It’s also used to manufacture paper, soap, and textiles in industrial processes.

Caustic soda can cause burns if it comes in contact with your skin or eyes. To keep yourself safe, follow these tips before working with this chemical.

Identify the Blocked Area

The first step is to identify the blocked area. Once you do that, you can take the required measures.

Before using caustic soda to unblock your toilet drains, ensure a physical blockage, like tree roots or a broken pipe, doesn’t cause the problem. If it is, and you pour caustic soda down your drains anyway, you may end up with a bigger mess than before!

Tips Before You Start Working With Caustic Soda

Caustic soda is not your typical household chemical; you should be cautious when handling it. It can cause severe burns and permanent damage to the eyes.

The smoke it produces is also dangerous and irritating. The following tips will help you work safely with caustic soda-

1. Wear protective gear 

This protects your skin from contact with caustic soda, which can cause serious burns.

A face shield will also be helpful since it protects your eyes from the effects of splashes of caustic soda, which can cause permanent damage to your eyes or blindness.

An apron will also be helpful since it protects the rest of your body from any splashes.

2. Ventilate the working area 

Make sure you have a well-ventilated area when working with caustic soda. The fumes that come from this chemical irritate the eyes and respiratory system.

Work outdoors or in a place with plenty of air circulation if possible. If you have no choice but to work indoors, wear a good respirator mask that filters out harmful gases and fumes.

3. Keep Children or Pets away 

If you have children or pets in your home, keep them away from the treated area until you have flushed the toilet several times.

4. Be careful disposing of waste products or solutions

Caution should also be taken when disposing of caustic soda waste products or solutions. Don’t pour this down your drain; it can ruin your drain pipes.

It would be best to have potassium carbonate or bicarbonate available for neutralizing.

Prepare the Tools and Materials that You will Need

To work with caustic soda safely and effectively, you must be prepared and understand the process. Before working with caustic soda, prepare the necessary tools and materials.

Like safety glasses, protective gloves, a container for mixing, newspaper or plastic sheeting for containing spills and splashes, a paper towel for wiping up spills, a dustpan and broom (or shop vac) for cleaning up spills, an outdoor space to work in and a strong container (such as a glass jar) with a lid to store the solution.

Preparation of Caustic Soda Solution

Step 1. Put on protective gear:

Caustic soda is highly corrosive and can cause severe burns to the skin. Therefore, you must wear rubber gloves and safety goggles before using caustic soda to unblock your toilet.

Step 2. Here is How to make a caustic soda solution

If you want to make your caustic soda solution home, you can easily do it with simple ingredients. All you need is caustic soda and water to make your solution. If you use caustic soda, take all necessary precautions, such as wearing a mask and protective clothing. Here are the steps you should follow:

  1. Pour 1.5 gallons of cool water into the bucket
  2. Slowly add one kilogram of caustic soda to the water.
  3. Stir the mixture using a wooden spoon or a stick until all the caustic soda is dissolved.
  4. The mixture will start bubbling slightly as the caustic soda mixes with the water.
  5. It will create fumes, so you mustn’t inhale any fumes that started from this chemical reaction, as they can harm your health.

So, if possible, you should do this outdoors or at least keep windows open if mixing inside.

Pour Caustic Soda Down the Toilet Bowl

  • Pour around 1 liter of caustic soda solution down the toilet bowl, followed by a kettle full of boiling water. Put the toilet cover close and leave it to work for about an hour.
  • The caustic soda will react together and create a chemical reaction to help clear the blockage in your U-bend or soil stack.
  • You’ll notice that the water in the bowl begins to change color as the chemical reaction occurs. This is because the caustic soda reacts with the waste in the toilet to break it down and dissolve the clog.
  • Repeat this process if you have a severe blockage or multiple clogs until the blockage has been cleared. This may take a few applications to work through stubborn deposits.
  • Once you are satisfied that the blockage has been removed, flush the toilet several times to ensure all traces of caustic soda have been rinsed.

If no waste has dissolved after several rounds of pouring caustic soda and leaving it for one hour, the blockage may be much further down the pipe than you think. Calling a professional plumber to diagnose and remove the problem will be better.

Washing up

After unclogging your toilet, wipe down the bowl and flush it. After that, clean any leaks or spills in the bathroom. And if you want your bathroom to smell better, use some household cleaning products and ensure any spills are wiped up.

Caustic Soda Splashes on Your Skin?

  • If you accidentally get caustic soda on your skin, immediately wash the affected area with water for at least 20 minutes.
  • The best strategy is to run the skin under a cool tap immediately. Showering works too, but it also gets everything else wet.
  • If you think the chemical may have splashed into your eyes, flush them out with water and ensure they are completely clean.
  • See a doctor immediately if you are experiencing any burning sensation, swelling, redness, or other unusual symptoms.
  • Be careful not to touch any areas that caustic soda may have splattered onto until you’ve finished washing it off and your skin is back to normal – you won’t want to cause additional damage by rubbing it around with your hands.
  • You should also wear gloves when handling caustic soda in the future to unblock your toilet and prevent a repeat occurrence of the same problem.

Final Words

Caustic soda can help you unblock your toilet, but you must take precautions. Wear gloves and eye protection, and dilute the product according to the manufacturer’s instructions. Caustic soda can burn skin and eyes, so handle the chemical carefully!


Is caustic soda safe to use for unblocking toilets?

Due to its reactivity, caustic soda unblocks toilets effectively but carefully handles them. Wear protective gear, work in a well-ventilated area to reduce burns and injuries.

Can caustic soda damage toilet pipes?

Improper or excessive use of caustic soda can harm certain pipes. Follow the manufacturer’s instructions, and dilute before pouring into the drain. Not effective for blockages caused by tree roots or broken pipes.

How do I prepare a caustic soda solution?

To prepare a caustic soda solution, follow these steps:
1. Put on protective gear, including rubber gloves and safety goggles.
2. In a bucket, pour 1.5 gallons of cool water.
3. Slowly add one kilogram of caustic soda to the water.
4. Stir the mixture using a wooden spoon or stick until all the caustic soda is dissolved.
5. Be cautious of the fumes produced during the mixing process, and try to do this step outdoors or in a well-ventilated area.

How long should I leave the caustic soda solution in the toilet bowl?

To clear a toilet clog, pour a caustic soda solution and let it sit for an hour. The reaction with waste dissolves the clog. Repeat if needed for tough blockages.

What should I do if caustic soda splashes on my skin?

In case of caustic soda splashes, wash the affected skin with water for 20 minutes. Rinse with cool water. Seek medical help for symptoms like burning, swelling, or redness. Always wear gloves when handling caustic soda.