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A 28 fl oz bottle of CLR Brands Septic System Microbial Support Treatment, featuring a blue liquid and molded handle, is a reliable choice in cleaning products for effective septic system care.
Blue CLR Septic System cleaner bottle showing detailed information on the back label.
CLR Septic System Cleaner & Treatment bottle with microbial illustration, promoting solid waste breakdown and organic waste support.
CLR Septic System cleaner by a drain with Safer Choice EPA badge on an orange background.
Person in bathroom, water swirling in toilet, clean drain; “Safe to use everyday. Any drain.”.
CLR Septic System bottle; pour 4 oz into toilet/drain, don’t mix cleaners, use with low water usage.
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CLR Septic System Cleaner & Treatment

Septic System is a septic safe drain cleaner made to help maintain a healthy septic tank, break down organic waste, and reduce the buildup that can lead to backups and odors. It was the first retail septic system treatment partnered with the EPA’s Safer Choice Program, recognizing it as a safer alternative to traditional chemicals.

Septic backups can happen when solids, sludge, grease, paper, and other organic waste build up inside the tank or lines. Septic System helps break down this buildup to support better flow through the system.

Blue CLR Septic System cleaner bottle showing detailed information on the back label.CLR Septic System Cleaner & Treatment bottle with microbial illustration, promoting solid waste breakdown and organic waste support.CLR Septic System cleaner by a drain with Safer Choice EPA badge on an orange background.Person in bathroom, water swirling in toilet, clean drain; “Safe to use everyday. Any drain.”.CLR Septic System bottle; pour 4 oz into toilet/drain, don’t mix cleaners, use with low water usage.

Overview

Ingredients

Instructions

Use Septic System regularly to help maintain your tank and reduce buildup before it becomes a bigger issue. Routine treatment helps support the bacteria in your septic system so it can continue breaking down household waste. Because Septic System is a liquid treatment, it can be poured into any toilet or drain line. This makes it easier to treat the system from different areas of the home.

  • The FIRST retail septic system treatment to be partnered with the EPA’s Safer Choice Program recognizing the product as a safer alternative to traditional chemicals.
  • With 7 treatments for systems up to 2000 gallons, it works instantly, can be used any time of day and its patented stabilization process allows for live, active bacteria to be deposited into the septic system.
  • Unlike competitors’ products, this innovative formula does not contain detergents, preservatives, and inert “carriers” that the bacteria attach to in use.
  • Can be poured down any drain vs. dry septic system treatments that can only be flushed down toilets, as well as uses more environment-friendly ingredients.
  • Breaks down the solid organic waste that can build up in your septic tanks, such as detergents, soaps, grease and paper, so that it can be dispensed safely into the ground.
  • Septic System uses only environmentally friendly ingredients. Safe on ALL pipes, drains and porcelain.

What’s great about it

  • EPA Safer Choice Certified
  • 80% Plant Based Ingredients
  • 100 uses... and counting! Explore How-Tos

Available Sizes

  • 28 oz bottle
UPC: 0-78291-72214-7, 0-78291-72285-7

Name

CAS

USE

Water
#7732-18-5
Dilutent

Diluent: CAS #7732-18-5. Reverse Osmosis (RO) is a water treatment process that removes contaminants from water by passing the water through a membrane, (filter), where contaminants are filtered out yielding more pure quality water.

Sodium Nitrate
#7631-99-4
Corrosion Inhibitor

Corrosion Inhibitor: CAS #7631-99-4. It can be used as an additive in industrial greases, as an aqueous solution in closed loop cooling systems, and in a molten state as a heat transfer medium. It is also a common food preservative.

Sodium Thiosulfate
#10102-17-7
Antioxidant

Antioxidant: CAS #10102-17-7.   Sodium Thiosulfate directly interacts with and neutralizes free radicals and other reactive oxygen species to prevent or slow the degradation of the product.  As part of the EPA Safer Choice Program, it has been evaluated and determined to be safer than traditional chemical ingredients.

Monoammonium Phosphate
#7722-76-1
Preservative

Preservative: CAS 7722-76-1.

FD&C Blue No. 1
#3844-45-9
Colorant

Colorant: CAS #3844-45-9. A blue dye used for foods and other substances. As part of the EPA Safer Choice Program, it has been evaluated and determined to be safer than traditional chemical ingredients.

Pseudomonas Putida
#68332-91-2
Cleaning Agent

Cleaning agent: CAS 68332-91-2.   Bacterium used to degrade materials such as fats, oils and protein soils.

This product was determined not to be Subject to Disclosure under the California Cleaning Products Right to Know Act.

Download Safety Data Sheet

  • Pour 4 ounces of the bottle directly into ANY toilet or drain line.
  • Use during times of minimal water use, such as overnight, to give the product more time to work in the system.
  • Do not mix with another chemical drain cleaner.  It’s best if used during times of minimal water usage.
  • Use it as part of a regular septic maintenance routine and follow the dosage instructions on the product label.
Explore our How-to Video Library
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Frequently asked questions

Septic System is safe on pipes and porcelain and works on fats, oils, grease and other stubborn organic matter. For best results, use it during a time of low water use, such as overnight. Do not mix it with chemical drain cleaners or other cleaning products.

Yes. CLR Septic System is safe for septic systems, pipes, drains, and porcelain when used as directed. It is designed to help maintain septic tanks by breaking down organic waste such as grease, paper, soap residue, and sludge buildup.

A septic system is an underground wastewater treatment system commonly used in homes that are not connected to a municipal sewer line. It usually includes a septic tank and a leach or absorption field.

Regular septic treatment can help reduce the buildup of sludge, grease, paper, and organic waste that may contribute to backups. Septic System is designed for ongoing maintenance and should be used as directed to support a healthier septic system.

Yes. Septic odors can be caused by organic buildup or an unbalanced system. Septic System helps break down waste inside the tank, which can support odor control as part of regular maintenance.

The purpose of the tank is to treat household waste. The tank treats the waste by the water falling to the bottom, the solids that are lighter float to the top and the heavier waste/sludge goes to the bottom. The sludge/solids that fall to the bottom must be treated with a septic system treatment to convert these materials into liquids which then will flow to the drain field.

Visit our "Retail Locator" section of the website for a complete list of participating retailers.

Yes, Septic System can be used in an RV or motor home. Call our 800# (800-323-5497) to find out the appropriate amount for your vehicle.

While the product begins working instantly it’s best if used during low water usage or overnight.

For a toilet bowl; pour recommended dosage per directions on the label into toilet bowl at night. Following morning flush the toilet.

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