How to unclog a septic tank? | Sanivac

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Septic Tanks

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How to unclog a septic tank?

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A blocked septic tank can lead to numerous issues, such as bad odors, strange noises, and even toilet overflows. It’s crucial to be alert to signs of malfunction, as a septic tank is more fragile than the municipal sewer system. As soon as you notice a problem, it’s essential to act quickly to avoid costly repairs.

How a Septic Tank Works

A septic tank filters wastewater from your home. Solid matter settles at the bottom, oils and grease float to the surface and form a scum layer, while water remains in the middle. A natural bacterial flora in the tank decontaminates the water before it flows to the drainage field.

Signs of a Blocked Septic Tank

  1. Slow Water Drainage: If water drains slowly from sinks, showers, or toilets, it could indicate an issue with your septic tank.
  2. Bad Odors: Unpleasant smells inside or outside the house can signal a malfunction.
  3. Water Accumulation Near the Tank: Puddles of water around the septic tank are another indicator of a problem.
  4. Unusual Noises in the Pipes: Strange noises may be a sign of blockages or malfunctions.
  5. Blocked Pipes: If a pipe is clogged, it could be a sign of a blockage in your septic tank.
  6. Sewage Backup in the House: If sewage backs up into your home, it’s a clear sign of a serious issue.

Causes of a Blockage

Blockages can be caused by:
  • An object obstructing the pipes
  • Buildup of sludge in the pipes
  • Issues with the tank’s operation or sizing
  • Excessive use of chemicals or antibiotics

Solutions for a Blocked Septic Tank

Initial Checks

  • Check the Solid Levels: Use a stick to measure the amount of sludge. If it exceeds 50% of the tank, it’s time to empty it.
  • Clean the Prefilter: It’s essential to keep the prefilter clean to ensure proper operation.
  • Inspect the Drainage Field: Make sure it’s not clogged.
  • Examine the Pipes: Test each faucet and flush to locate the blockage.

Unclogging Attempts

  • Clogged Prefilter: Regularly clean it to avoid residue buildup.
  • Blocked Inlet or Outlet Pipe: Use a hose or a pressure machine to clear the blockages.
  • Full Septic Tank: If it’s full, contact a professional to have it pumped.
  • Full Grease Trap: Clean it every six months to prevent obstructions.

Blockages in a Septic Tank

Blockages in a septic tank can occur in various places, from your pipes to the tank itself. It’s crucial to correctly identify the source of the problem before attempting to resolve it. For any additional help, our team at Sanivac is available to offer you an appropriate solution.

Trust Sanivac for Your Septic Tank Pumping

Regular maintenance of your septic tank is essential to prolong its lifespan. Cleaning the prefilter and pumping the septic tank are key elements to ensure the proper functioning of your system. Sanivac is your best ally for advice on preventive maintenance and pump-outs. To learn more about our septic tank pumping services, visit our service page!

Sanivac and Soluo

Sanivac does not offer inspections or install septic tanks. We specialize in the maintenance and pumping of septic tanks. For septic tank installations or inspections, we recommend contacting our partner Soluo, which specializes in septic installations.

About Soluo:

Founded in 1995, Soluo is a Quebec-based company specializing in the inspection, design, and work of septic installations throughout Quebec. With a wealth of specialized content online and free support services, Soluo is the true reference in septic installations in Quebec. Each year, more than 500 septic installations are inspected, designed, and installed by Soluo’s 65 experts. Soluo has become an industry leader thanks to its commitment to providing the best support to Quebec customers in their septic installation projects. For more details, visit soluo.com.

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The Sanivac Expertise

We answer your questions

Sanivac offers a complete solution for the maintenance of urban, sanitary, and environmental infrastructures. Our main services include :

We provide services for construction sites, municipalities, outdoor events, food industries, schools, shopping centers, farms, and private residences.

This answer depends on the region you’re located in! Thanks to our 9 strategically located branches across Quebec and Ontario, Sanivac serves a very large territory including :

  • Montreal, Laval, Montérégie, Estrie, Lanaudière, the Laurentides, Mauricie, and the Capitale-Nationale region
  • The Outaouais and Ottawa regions through our Gatineau and Ottawa offices

This regional presence allows us to ensure fast service, optimized logistics, and genuine proximity to our clients.

📍 Check out our service map here !

Absolutely. Sanivac is known for having the largest inventory in Quebec, with over 15,000 sanitation units, including :

Our units are available for short- or long-term rental, always delivered clean, inspected, and maintained on a customized schedule.

Yes. We use high-pressure combo trucks for cleaning pipes, unclogging catch basins, garage drains, and even storm and sanitary conduits in underground infrastructure.

This service is essential in spring and fall, especially for commercial buildings, schools, municipalities, and shopping centers that need to prevent backups and flooding.

Yes. Sanivac offers septic tank pumping and maintenance services, mainly in rural areas or for cottages not connected to municipal sewers. We also service holding tanks, sealed tanks, catch basins, valve chambers, grease traps, and more.

We send maintenance reminders and adjust the frequency based on usage and municipal regulations.

Yes. Our team is available for emergency interventions, whether it’s an overflow, a clogged drain, or critical equipment that is no longer functioning. Thanks to our fleet of more than 375 specialized trucks, we can respond quickly based on priority and geographic area.

You can request a quote online in just a few clicks on our website. Simply select the service you’re interested in and fill out the form. A member of our team will contact you promptly to confirm your needs and offer a suitable solution.

Yes ! Sanivac is a Quebec family-owned company founded in 1961, now led by the third generation of the Kelly family. Although we are now present through 9 branches and more than 435 employees, we have preserved our close-knit spirit, our strong sense of service, and our local commitment.

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