Down John (Once-A-Year) Septic Tank Treatment | 1 Year Supply | Eco-Friendly Product, 3-Part Concentrate Live Bacteria, Carbon &

4.71 out of 5
(8 customer reviews)


Scent Odorless
Item Weight 13 Ounces
State of matter Liquid
Liquid Volume 2 Fluid Ounces

  • A 3 MINUTE TREATMENT THAT WORKS ALL YEAR! Take 1 minute a day over 3 days to flush each eco-friendly product component down your toilet. Create a powerful safe matrix inside your tank in which trillions of living bacteria & septic tank enzymes thrive and multiply, working tirelessly to digest and continually clear your entire septic tank and system. Unlike short-lived monthly treatments, DOWN JOHN’s performance peaks in the first three months, maintaining maximum peak digestion for over a year!
  • REMOVE ODOR & GREASE CAP IN DAYS: One pack of DOWN JOHN Septic Tank Treatment withstands the toxic effects of household products such as detergents, bleach, soaps and antibiotics. It will then digest solids and sludge, toilet paper/paper-based products, and grease or oils in a standard 1000-gallon septic system, removing odor in days. Whether you are saving a struggling system or maintaining an apparent asymptomatic one, DOWN JOHN has been intentionally formulated with all of this in mind.
  • RESTORE DRAIN FIELD & AVOID EXPENSIVE REPAIRS: Data-proven to revive your ENTIRE septic system, DOWN JOHN is based on biological science principles that for over 20 years have proven to work. Live bacteria and digestive septic enzymes travel from your septic tank into your drain lines and drain field unclogging and cleaning out as they go. Blockages are broken down in lines and soil, restoring healthy flow and improving absorption, which could save you THOUSANDS in unexpected major repairs.
  • SAVE MONEY & TIME: Save HUNDREDS on yearly pump-outs using this powerful once-a-year-only septic tank additive. Live worry-free for less than $6/month with a product whose powerful digestive performance peaks in the first 3 months and lasts over 12 months! Use SUBSCRIBE & SAVE to save up to 10% OFF! The perfect septic maintenance product for commercial and residential septic tanks. Shelf life of 5 years. Sold across the US to THOUSANDS of satisfied customers!
  • GIVE BACK TO THE ENVIRONMENT: All DOWN JOHN Septic Tank Treatment components are 100% naturally-occurring, non-toxic and non-corrosive ingredients that are easy to use, safe for you, your children, and your animals. The run-off into your leach field is an excellent N-P-K fertilizer. Odor-free, bacteria-rich and non-toxic, DOWN JOHN effluent is full of valuable nutrients and fixed organic nitrogen that enriches soil and promotes grass growth!


Product Description

Make your septic tank function better and last longer with a single annual treatment of DOWN JOHN. This proprietary formula does what other products don’t, dissolving grease, digesting waste, and removing the household chemicals, bleach, detergents and soaps that normally kill off the healthy bacteria in your tank.

DOWN JOHN works right away and for more than a year. Odors go away within days and backups clear in under 2 weeks. Within 3 months, lateral lines will be clear and the soil in your leach fields will support grass and plant growth again.

Start using DOWN JOHN to prevent plugged lines and backups, and save hundreds on pump-out costs and system repair. A single pack will treat a septic system up to 1,000 gallons capacity for one year.


From January to September 2014, Oklahoma State University’s Division of Agricultural Sciences & Natural Resources tested the Down John bacteria on the manure tanks for their 20-pig hog farm. After 10 weeks of the Down John bacteria colonizing the tanks, the effluent exiting the tanks plateaued and sludge buildup stopped being an issue. The same was true for the carbon, nitrogen and phosphorus exiting the tanks.
Now … if DOWN JOHN performs that well for 9 months on a hog farm, imagine how well it will work in your septic system!


  • Revives blocked and struggling septic systems 
  • Eliminates odor
  • Clears lateral lines
  • Improves leach field absorption
  • Reduces sludge and grease buildup

  • Reduces need for frequent pump-outs
  • Prevents problems that require system repair
  • Offers convenience and cost savings of a once a year application instead of monthly treatments

  • Reduces greenhouse gases
  • Improves air quality
  • Helps protect waterways
  • Produces richer soil 
  • ​Binds toxins
  • Eliminates nitrates
  • Creates a healthy fertilizer

Important information


Complete septic tank & drain field treatment, flushable, non-corrosive & safe-to-use, powerful enzymes dissolve grease cap, digestion activity from live liquid bacteria blend & damp carbon reduces waste blockages & sludge build up, cleans tank, lines & soil, provides a clear nutrient-rich effluent that stimulates plant growth. Bacterial digestion activity peaks in the first 3 months & is maintained for a full year. Timely re-treatment sustains full digestion activity.

Legal Disclaimer

Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.

Additional information

Weight 13 lbs
Dimensions 3.9 × 4 in
Product Dimensions

‎ 4 x 3.9 x 4 inches; 13 Ounces

Item model number

‎ DJ-12

Date First Available

‎ September 10, 2013


‎ B00F3M0M1M

Country of Origin




8 reviews for Down John (Once-A-Year) Septic Tank Treatment | 1 Year Supply | Eco-Friendly Product, 3-Part Concentrate Live Bacteria, Carbon &

  1. 5 out of 5

    Amazon Customer

    Awesome productSo I was ready to rip up my septic system because I was told that it needed to be repaired or I should should hook up to the city drain due to a stinky leak that I had any time we washed or had a busy water use day at home I was stressing out but I thought I would look for something online and found down John Wow this stuff works I just put it to the test about a week later after using the product no more stink no more leaks this product is awesome stress is gone my drains are working perfectly the only thing I think I would make people aware of is to check your septic system size because I originally had only bought one box but it wasn’t enough one box only treats 1000 gal system and my system was 1500 gal so I needed to buy a additional box it would be cool if they sold a 1500 gal system box appose to have to buy 2 complete boxes but I’m super happy with the results and I will be recommending this product to everyone I know that has septic systems I’m a believer thanks down John

  2. 5 out of 5

    Susan C.

    Great ProductPurchased last year and was pleased with results. Time for another treatment. May look little pricey but for a year’s worth of treatment instead of monthly, really a great buy.

  3. 5 out of 5

    AZ Crazy

    I just reordered after a yearThis is the second year that I’ve used this product. I decided to try it instead of using a monthly product. It worked as advertised and saved me some $ over the year. Plus the dosing is once a year as opposed to monthly.

  4. 5 out of 5

    Kevin Wimbley

    Follow the instructions.This is the second time I used it. It’s a annual product. I recommend it to anyone. Never had any septic problem since.

  5. 5 out of 5

    Texas Transplant

    After two years of using Down John my 30 year old septic is looking like NEW!UPDATE 4/22/2021Just had my septic flushed for regular maintenance and was told that everything looks great now! 30+ year old system. Before I started using it two years ago. I was told that I should look at putting in an EXPENSIVE Aerobic system. Tried Down John as a “last hope” and IT IS WORKING!!!. My lateral lines are a being cleaned and there are NO problems. While I noticed a slight improvement after about 6-8 months, there is now a HUGE change from a couple of years ago. Septic is working like it was new.If someone on this website is complaining about Down John after only two or three MONTHS of use, its because they haven’t given it a chance to work. Don’t forget that there are usually YEARS of sludge and buildup that it has to work through.TRY IT!Update: 3/24/2020My septic is 30+ years old. (installed in 1987) I was having problems with getting A LOT of solids in the second tank, which shouldn’t be there. The lateral lines also had “issues”. I used Down John for the first time about 8-9 months ago. We recently had some very unusual torrential rains in my area (4-5″ in about an hour). This created a LAKE over my septic tanks and some lateral lines. The rain flooded my septic tanks and I had to have the rain water pumped out. When the septic was inspected this time, there were NO solids in the second tank. Down John did exactly what I hoped it would do!It looks like it will save me from having to install a new $8000++ Aerobic septic system. DOWN JOHN IS DEFINITELY WORTH THE MONEY!!!———————————————————————————-It has been two months since I added Down John. so far so good. NO issues or back ups. It will take another 10 months or so get a final reading. At that time my septic gets it’s yearly pumping and I will be better able to see inside the tank and how everything has “broken down”.When I originally used Down John, I liked that it was a three-part system. I am hopeful that this is a cure not a “band-aid” for septic systems like the one-part products. None of the one step products I had previously tried seemed to do anything.———————————————————————————————–Unlike other”1-step” products I have used with marginal results in the past. This is a well-thought out system. 3 parts over three days to get the system back into shape.I had a question and called the company. The owner of the company, (and inventor / chemist!) took ten minutes to discuss my particular issues and made a few suggestions. Treatment takes time so I won’t know fir a while how well it works but so far, it looks good!Given the cost of getting a new system, it is definitely worth a try.

  6. 3 out of 5


    Carbon Pack was a solid blockI have used this product once before with no issues, but this package was different. The black carbon package was a solid block. I was afraid to try to flush it and the return window had closed.

  7. 5 out of 5

    Tracy Cummings

    My second purchaseI love this product and the little sticker that hangs out under a magnet on the side of my fridge to remind me to place my next order for treatment. Zero septic issues and I will continue to use this product!

  8. 5 out of 5

    Ryland Davis, Jr.

    Really works!Regularly use septic treatments every 3 months, but recently I noticed a foul smell coming from my septic tank. Found this product on amazon, followed the directions for use and after about 3 weeks the smell was completely gone. It is also very convenient that you only have to use this once a year, but it is quite expensive compared to the normal treatments. But I don’t mind paying since it clearly does exactly what it says on the box.

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