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32 oz. Oil Tank Fuel Sludge Treatment and Fuel Tank Cleaner

  • Ideal for dispersing sludge to prevent burner breakdown
  • Helps to avoid tank corrosion and winter freeze-ups
  • Used to extend life of oil tank
  • View More Details
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Product Details

Hercules Sludge Treat storage tank additive cleans and conditions heating system fuel oil to prevent fuel-related failures, improve combustion efficiency, reduce soot formation and conserve energy. It is important to help extend the life of a fuel tank. Behold the power of Hercules, products built to last and trusted by plumbers to withstand even the toughest conditions.
  • Helps extend the life of your fuel tank
  • Disperses sludge and emulsifies water in fuel oil tanks to help eliminate burner breakdown
  • Helps prevent tank corrosion and winter freeze-ups
  • Works to help maintain a steady flow
  • Helps combustion efficiency
  • Reduces soot formation and conserve energy
  • Return Policy


Dimensions: H 7 in, W 2.25 in, D 2.25 in


Product Depth (in.)2.25 inProduct Height (in.)7 in
Product Width (in.)2.25 in


Chemical FormLiquidCommercial / ResidentialCommercial / Residential
Compatible Pipe MaterialPVCContainer Size (oz.)32.0
Drain Cleaners TypeBathtubFeaturesNon-Corrosive, Septic Safe
For Septic UseSeptic SafeMaintenance, Repair & Supplies Product TypePipe Cement, Primer & Cleaner
Number of treatments per container1Pack Size1
Prevention formulaNoProtects pipes from corrosionYes
Returnable90-DaySafe for garbage disposalsNo
Set Time (Min.)1Type of IssueDrain
Where to UseShower

Warranty / Certifications

Certifications and ListingsCertified ListedManufacturer Warranty1 year

Questions & Answers

Q:Will this work in a waste oil heater tank? Tank is only 15 gallons but has a good inch or so of sludge in the bottom. Thanks
by|Nov 18, 2023
1 Answer
Answer This Question

A:  Please contact technical@oatey.com.

by|Nov 29, 2023
    Q:I have a 275 gal tank but will only take 250 gal of oil so I figured about 25 gallons of sludge how much should I use of the sludge mix should I use
    by|May 21, 2023
    2 Answers
    Answer This Question

    A:  I had a large slug problem in my 275 gal tank. My furnace guy told me to put in 32 oz. (1 qt.) and have the tank filled. On all the next fill ups put in 16 oz. (1 Pt.) Been doing this for a few years now and haven't had any problems.

    by|May 21, 2023

      A:  The 25 Gallons could also be air at the top, because the delivery person is required to stop when the whistle stops, the whistle sticks down into the tank a bit (more than you might think). I suggest adding this product immediately before your oil delivery, and consider 275 gallons and 250 gallons to be nearly the same when considering how much to add. This makes the math easy, for your tank, use 1/4 of this bottle. Repeat that before each fill up.

      by|May 30, 2023
        Q:how much for 250 gallons
        by|Sep 24, 2022
        3 Answers
        Answer This Question

        A:  You would use the entire container

        by|Apr 6, 2023
          1 found this answer helpful

          A:  they say 1 pt. for 275 gal.

          by|Sep 27, 2022

            A:  I have a 275 gallon tank and I pour the entire bottle in before fill up. Seems to work great, oil filters and oil pump screen are much cleaner after a couple of years use

            by|Nov 20, 2022
              1 found this answer helpful
              Q:Is this product effective for B20 Biofuel.
              by|Oct 28, 2021
              2 Answers
              Answer This Question

              A:  Yes. I use it in B20 blended fuel with good results.

              by|Dec 23, 2021

                A:  Yes it can be used for this application.

                by|Oct 29, 2021
                  Showing 1-4 of 19

                  Customer Reviews

                  4.6 out of 5
                  • 4.6
                    out of 187 reviews
                  • 97% recommend this product
                  Filter by:
                  Showing 1-10 of 187 reviews
                  I purchased both the sludge and Hot burning…..
                  All it is is mineral spirits. I purchased both the sludge fighter and hot burning additive and they have the same ingredients…….sheesh!
                  Response from Customer serviceSep 7, 2023
                  Thank you for writing a review. The Sludge Treat is for larger systems and the Power flow is for smaller systems. If you have any questions about our product reach out to us at technical@oatey.com.
                    Easy to use and effective!
                    Easy to use and effective!
                    • Verified Purchase
                    • Recommended
                    1 found this review helpful
                    The stuff works! Two years I had continuous problems of one kind or another and always had to be ...
                    The stuff works! Two years I had continuous problems of one kind or another and always had to be calling for help when my furnace would stop running. My kerosene tank used to be under my deck thus I never had any problems. Once we removed it and purchased a new tank we had it installed behind the house and then we noticed we started having problems due to the weather and the outside elements. Somehow water was getting into the tank. The oil company changed a few things and recommended I put this stuff in once a year. It worked! I will never go without it!
                    • Verified Purchase
                    • Recommended
                    2 found this review helpful
                    The product worked to de-clog our oil tanks. It did what we wanted it to do.
                          Put half a bottle into my 275gal tank about a week ago and tried to stir it up a bit. Just turned on my heat yesterday and the system's working. We'll see how it handles the first tank fill of the year in a few weeks.
                            Four years tested. It faults nozzles .
                            I original thought this product could make my heating oil system better with so many +. Tried it for 4 years: every time I added it into a full tank, in a week, nozzles started to go bad (CAD cell display reads go up), then the nozzle stops working in about 1 month. Tried brass and stainless nozzles, same thing. Added 3 spin on filters, same thing. Nothing looked dirty but nozzles failed quickly with this product added in. Without it for 2 years, nozzles still give the same O2 reading.
                            Response from OateySep 21, 2023
                            Thank you for writing a review. We realize your experience with our product has been less than ideal and we would like to have the opportunity to change that, as quality is a top priority at Oatey. If you are still having issues with this product, please reach out to us directly at technical@oatey.com so that we can help. Oatey
                              • Verified Purchase
                              • Verified Purchase
                              Showing 1-10 of 187 reviews

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