Is CLR Safe For Septic? All You Need To Know

If you have a septic tank, then you know how important it is to maintain it properly and to pay attention to what cleaning agents you use. In case you use CLR products, you probably asked yourself, Is CLR safe for septic?

Yes, all CLR products are safe for septic systems. This is because the water breaks down its chemicals before they can cause harm to other parts of your plumbing system. CLR products contain environmentally friendly ingredients which are safe on drains, pipes, and septic systems.

After reading this article you’ll have a better understanding of CLR products and their possible impact on your septic system. Check it out!

Is CLR safe for septic?

Is CLR safe for septic

First of all, before I answer the question is CLR safe for septic, it’s important to remind you that there are a lot of CLR products these days on the market.

It goes from multi-use CLR which is great for removing limescale and rust stains to more specific cleaners like CLR for a septic system, CLR for pipes and drains, CLR for mold and mildew, CLR grease-free, and many, many others.

However, no matter which CLR cleaning agent you use, one is for sure, they all are safe for your septic tank.

The reason for this is the fact that by the time the cleaning product reaches the septic tank it has already been diluted with water and thus has become completely harmless.

CLR cleaning agents are water-based acids that safely clean and brighten most surfaces. The active ingredient in CLR products is hydrochloric acid.

When you use CLR to clean your toilet bowl, sink, drains, or pipes it dissolves the scale and rust that builds up on those surfaces.

After using CLR to clean your sink or toilet bowl, you will need to rinse the area with water so that the acid can neutralize and break down into harmless elements.

Is regular CLR safe for septic systems? 

The answer to this question is yes, regular CLR (Calcium Lime and Rust removal) is safe for septic systems.

Before you start cleaning, open the windows and turn on the exhaust fan in your bathroom to remove any moisture from the air.

This will help prevent fogging up mirrors or windows during use.

Is CLR mold and mildew septic safe?

Yes, CLR mold and mildew are septic-safe. It’s actually been tested by the manufacturer and meets LEED Standards for plumbing, septic systems, vegetation, and marine life.

As always as a general rule, we always recommend that you follow the instructions on the product label to be sure to use it adequately.

How does CLR septic work? 

Before you start using it it’s convenient to know how CLR septic works.

CLR Healthy Septic System Treatment is a safe product for use on pipes and porcelain.

It works to dissolve stubborn organic matter such as fats, oils, grease, or other organic particles.

It also works to remove mineral deposits, rust, and other hard water stains.

CLR Healthy Septic System Treatment is an environmentally-friendly product that is biodegradable and non-toxic.

It won’t leave any harmful residues behind once it has done its job, making it safe to use in and around your home.

The sludge/solids that settle to the bottom must be treated with a septic system treatment to convert these materials into liquids, before being released into the septic system pipes.

How to use CLR septic treatment? Do you flush CLR septic treatment? 

Directly pour 4 ounces of one bottle into a toilet or drain. There is no need to mix with other chemical cleaners.

Use at times when the sewer system and water usage are minimal, my recommendation is to leave it overnight.  

This septic system treatment begins working instantly to break down stubborn organic waste, including detergents, paper, and soaps.

Unlike dry septic system treatments, CLR Septic System Treatment contains no inert ingredients that could cause blockages.

This product can be poured down any drain without the worry of clogging or damaging pipes and septic tanks.

Things You Should Never Do With CLR: 3 DON’TS

While the product is safe to use on most surfaces, there are some things you should never do with CLR.

It’s important to note that CLR is much more powerful than regular household cleaners – so you should always be careful when using it.

1. Don’t use it before testing it on the surface.

Although the product is safe for most surfaces, some are not compatible with CLR.

To avoid damaging your valuable property, test the product on a small area before using it on large surfaces.

2. Don’t mix CLR with other household cleaners.

Mixing CLR with any other cleaning products will be dangerous since they contain different components that react differently with each other when mixed together.

This can cause chemical burns and irritants in your home, which is why you should never mix the two together.

3. Don’t use CLR in an unventilated space.

When using CLR, always make sure that there is adequate ventilation because when combined with water, this product produces fumes that can irritate the eyes and lungs of humans if inhaled in large amounts.

What cleaning products can I use with a septic tank? 

Many household cleaners are safe for use with septic systems, but you should always check the label to see if a product is labeled “septic-safe.”

Bleach-containing products are safe for use with septic systems in small amounts, and mild detergents, like laundry detergents, are generally safe for use with those same systems.

Chemicals that are harmful, such as phosphates and harsh detergents, should be avoided.

Although cleaning products containing ammonia are safe for septic systems, avoid using large amounts.

Water-based cleaners, such as water-based carpet cleaners and tub and toilet cleaners, are safe for septic system use in small amounts.

What chemicals should you not put in a septic tank?

Chemicals such as bleach, motor oil, and rat poison are toxic to the bacteria that break down waste in septic tanks.

If these substances end up in your tank they will kill off all of those helpful microorganisms – which could lead to serious problems with sewage backup into your home or other drainage issues.


Check here what our readers asked about this topic.

Is it OK to put vinegar in a septic system?

Yes! Vinegar is safe to use in your septic tank, as long as you’re careful not to use too much. The acidity level of vinegar helps to break down waste and flush it out of the tank. Vinegar will not cause damage or harm your system.

What cleaners can you use if you have a septic tank?

I personally don’t like to use powder cleaners or detergents because they tend to clog up pipes, especially if they’re not rinsed out properly. Many kinds of cleaners can be used in a septic tank, including bleach-based cleaners, mild detergents, and phosphate-free detergents.

In a nutshell 

CLR is the go-to for septic system care because it works effectively to unclog drains and pipes without causing any harm to your septic system.

Of course, to avoid problems with your septic system, it’s always advisable to contact a professional plumber. 

Now you have your answer on a question is CLR safe for septic.

In case you need to know more about this topic, leave me a question in the comments and I’ll get back to you with more info.

Happy cleaning!

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