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  • Thetford Fresh Water Tank Sanitizer Detergent and Treatment, 2 x 24 oz Bottles - 36662

Thetford Fresh Water Tank Sanitizer Detergent and Treatment, 2 x 24 oz Bottles - 36662

4.5 out of 5 stars (649)
$23.10 with 18 percent savings
$0.48 per fluid ounce
List Price: $28.21
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About this item

  • [VERSATILITY]: Thetford's Fresh Water Tank Sanitizer works in RVs, trailers, campers, and boats
  • [FUNCTIONALITY]: Cleans and sanitizes the inside of the freshwater tanks and the plumbing
  • [UTILITY]: Kills 99% of the harmful bacteria, including Staphilococcus, E-Coli, Listeria, and other micro-organisms
  • [CONVENIENCE]: Easy-to-use 2-part system for cleaning and sanitizing the fresh water tank
  • [SAFETY]: Free of bleach and chlorine, leaves no smell or taste

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4.2 out of 5 stars (430)
$14.50 ($0.23/fluid ounce)
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From the manufacturer

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About Us

As a manufacturer of mobile sanitation products for the RV, marine, camping and truck markets, Thetford makes mobile living a more pleasant experience. Thetford products include complete lineups of: Lightweight, low-water-use toilets permanently mounted in RVs, boats or trucks. Hand-carried, fresh-water-flush, self-contained portable toilets that have a multitude of uses. Specially formulated waste holding tank deodorants and treatments used with these toilets. Innovative, multi-capacity tote tanks. Other products that make mobile living more convenient, quicker, cleaner and easier

Product information

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Product Description

Thetford's Fresh Water Tank Sanitizer is an easy-to-use 2-part system designed for cleaning and sanitizing fresh water tanks and plumbing on RVs, trailers, campers, boats, water coolers, coolers, ice machines, refrigerators, ice chests, or any washable hard, non-porous surfaces.

Step 1: Clean with the detergent

  1. Empty the tank and add 1 ounce of concentrated detergent solution to the fresh water tank for every 4 gallons of tank capacity.
  2. Fill the tank with water and run the diluted detergent through each faucet, shower, and water outlet for 1 minute or more.
  3. Empty the tank and rinse the faucet lines and tank by running fresh water through them.

Step 2: Sanitize the water

  1. Shut off incoming water line and prepare a solution of 2 ounces of product per 8 gallons of water.
  2. Apply or circulate solution to wet all surfaces, allowing it a minimum contact of 60 seconds.
  3. Drain the solution and return to service by reopening incoming water lines.

The treatment is effective even in hard water and will not leave grit or soap scum. Not a drinking water additive.

What's in the box

  • Thetford Fresh Water Tank Sanitizer Detergent and Sanitizer Treatment, 2 x 24 oz

    • Top Brand: Thetford

    Highly Rated
    100K+ customers rate items from this brand highly
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    50K+ orders for this brand in past 3 months
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    Important information

    Ingredients

    Fresh Water Tank Sanitizer Kit

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    Next page

    Customer reviews

    4.5 out of 5 stars
    649 global ratings
    Sponsored

    Customers say

    Customers find the cleaning agent effective, with one noting it works well with minimal contact time, and they appreciate its ease of use for sanitizing fresh water. The product receives positive feedback for its quality, particularly for RV use. Opinions are mixed regarding odor removal and taste - while some say the smell is gone and water tastes clean without cleanser residue, others report foul odors and tastes. Additionally, customers mention it takes a long time to wash out the suds.
    AI Generated from the text of customer reviews

    Select to learn more

    41 customers mention cleaning performance, 37 positive, 4 negative
    Customers find that the cleaning agent works very well, keeping the tank fresh and making it much cleaner, with one customer noting it requires minimal contact time.
    Worked GREAT. I'll be using this again when I get the coach out of storage... Follow the directions.Read more
    works great . had very bad smell from boat fresh water system. product cleared it up.Read more
    Works very well to clean the tank....Read more
    ...This cleaned it completely and though there was a lot of suds coming out at the end it was a clear clean type of suds that shows it was well cleaned...Read more
    18 customers mention ease of use, 16 positive, 2 negative
    Customers find the cleaning agent easy to use, particularly for sanitizing fresh water.
    Gettin the old rv ready for another season...LIKE the product...easy to use and works better than sanitizing with bleach..better price than at the...Read more
    easy to use to sanitize fresh water and get rid of foul smell and tasteRead more
    Easy to perform treatment and water is more to our liking.Read more
    Used to disinfect our brand new camper water tank. Was easy to use when following instructions....Read more
    9 customers mention quality, 9 positive, 0 negative
    Customers find the cleaning agent to be of good quality, particularly noting its effectiveness for RV tanks.
    Good productRead more
    Great product for RV. Easy directions to follow.Read more
    This is a very good product, especially if you buy a used rV and don’t know how well it was maintained....Read more
    Great product.Read more
    24 customers mention odor removal, 13 positive, 11 negative
    Customers have mixed experiences with the cleaning agent's odor removal capabilities, with some reporting that the smell is gone while others say it has a bad one.
    ...With the hopes that it will sanitize those tanks and help with the odor that you occasionally get in your RV.Read more
    ...The smell always came back. It takes time and water of course but if you follow the directions to a "T" this will do the trick for you!...Read more
    ...Now, I no longer have that plastic tank taste / smell in my water....Read more
    Purchased camper 3 months ago and water had awful taste and a chemical odor. Did a bleach treatment and NO change....Read more
    14 customers mention taste, 6 positive, 8 negative
    Customers have mixed opinions about the cleaning agent's taste, with some reporting that the water tastes clean without any cleanser taste, while others mention a foul taste.
    ...After all said and done it had a little bit of taste for a few tanks of water and did foam up for while but taste and foam went away after a few...Read more
    Finally, good tasting water in themotorhomeRead more
    ...fresh water tank four times prior to our trip and still was unable to eliminate the taste and smell of the chemicals....Read more
    Water tasted clean without any cleanser taste. It was easy to use....Read more
    11 customers mention cleaning time, 1 positive, 10 negative
    Customers report that the cleaning agent takes a long time to wash out suds and is difficult to clear from fresh water.
    This process takes a little while to complete so I'd allow at least 30 minutes and lots of water....Read more
    ...It seems to clean and sanitize as expected. It takes a little more time and water to flush out the system than I expected (in both steps) but well...Read more
    ...It's not. I used it as directed, but found it hard to eliminate the sanitizer from the fresh water tank.Read more
    ...It takes a long time to drain the tanks and refill and drain again but it was worth it.Read more
    Please read this review. I am not sure if ...
    1 out of 5 stars
    Please read this review. I am not sure if ...
    Please read this review. I am not sure if my system is sanitized yet since I can’t use(drink) the water yet due to the intense smell and foam. As others have posted the post cleanse foam is still perstent and we have flushed our fresh water (47gallons) tank 4 times. I would not want anyone else to expend the time and resources (water,electric,wear on the pump). I am not even sure if it’s safe to have contact or yuck drink from the tank if it ever stops foaming.
    Hide
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    Top reviews from the United States

    • KB
      5 out of 5 stars
      Fresh water
      Reviewed in the United States on May 30, 2026
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Does a outstanding job on cleaning tanks and plumbing in my camper

      Sending feedback...
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      Thanks, we'll investigate in the next few days.
    • Julie
      5 out of 5 stars
      Who knew??
      Reviewed in the United States on July 25, 2025
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      There’s a learning curve with the first RV. Water was one of those things. After each trip we ran the faucets until the tank was empty. Or so we thought. Turns out it’s very important to pull the plug draining the tank from below AND pull the plug to empty the water heater. We didn’t. Pretty soon our water smelled very nasty. We put bleach into the tank, drove it around to slosh it around. Still nasty. I did some research and found this product so I bought it. Followed the directions and now our water is fresh as can be. There’s zero scent to our water. Worth every penny to have a clean system. We also bought a “wand thingy” that sprays into the water heater to clean it out right before we used this product. Some sediment came out with that. I think using both this product and the sprayer are both good practices to keep everything clean.

      7 people found this helpful
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    • TAngell
      5 out of 5 stars
      Satisfied.
      Reviewed in the United States on September 4, 2025
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      I tried this. Not sure if it was the better choice over regular chlorine. But I assume it is less harsh than diluting chlorine and damaging the plastic and PVC piping in the motor home. I removed all filtration before using and flushed out several tanks of water before putting back into service. I didn’t notice any chemical smell or foaming in the water afterwards.

      2 people found this helpful
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    • BWBCAM69
      4 out of 5 stars
      Good product, but a little taste and foam or a bit.
      Reviewed in the United States on February 27, 2025
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Used to disinfect our brand new camper water tank. Was easy to use when following instructions. After all said and done it had a little bit of taste for a few tanks of water and did foam up for while but taste and foam went away after a few tanks. We even dumped a full tank after the treatment. Overall good product. I feel that it did a good job cleaning and I would buy it again.

      6 people found this helpful
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    • Robert A. Frascella, JR.
      5 out of 5 stars
      Use on the fresh water tank of boat
      Reviewed in the United States on October 13, 2024
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      I used this to clean and sanitize the freshwater tank of my boat. Somehow I got some odor in the 30 gal tank even using a capful of bleach. This Sanitizer freshened it right up. Just use as directed. flush system until water shows no foam. Water tank hose been fresh for 6 months now.

      7 people found this helpful
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    • bill powell
      5 out of 5 stars
      Resolved bad taste and odor first time
      Reviewed in the United States on July 19, 2024
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Purchased camper 3 months ago and water had awful taste and a chemical odor. Did a bleach treatment and NO change. Terrible chemical smell and awful taste. Purchased this kit and used as directed and I am very happy to report the smell is gone and the taste is perfect! Back to drinking water right out of my camper spigots!! Made my used camper purchase seem brand new! Highly recommend. This worked perfectly for me.

      5 people found this helpful
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    • ACB
      5 out of 5 stars
      Love it no bleach smell
      Reviewed in the United States on May 14, 2024
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Does the job keep fresh tank clean and easy to use just wish did not have to waste so much water to flush it

      3 people found this helpful
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    • Jnl519
      5 out of 5 stars
      Works as advertised
      Reviewed in the United States on October 31, 2024
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      Full content visible, double tap to read brief content.

      Even after adding extra water and flushing their system we still had that smell that no one wants. This cleaned it completely and though there was a lot of suds coming out at the end it was a clear clean type of suds that shows it was well cleaned and safe to use.

      7 people found this helpful
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    Product Summary: Thetford Fresh Water Tank Sanitizer Detergent and Treatment, 2 x 24 oz Bottles - 36662

    From Thetford

    4.5 out of 5 stars, 649 ratings

    Customer reviews

    50+ bought in past week

    Price

    One-time purchase: $23.10 ( $0.48 / fluid ounce) 18% Savings

    List Price: $28.21

    Subscribe & Save price (No fees, Cancel anytime): $23.10 ( $0.48 / fluid ounce) 18% Savings

    List Price: $28.21

    Additional savings available through Subscribe & Save (No fees, Cancel anytime)

    Purchasing options

    Other sellers

    Other sellers

    About this Item

    • [VERSATILITY]: Thetford's Fresh Water Tank Sanitizer works in RVs, trailers, campers, and boats
    • [FUNCTIONALITY]: Cleans and sanitizes the inside of the freshwater tanks and the plumbing
    • [UTILITY]: Kills 99% of the harmful bacteria, including Staphilococcus, E-Coli, Listeria, and other micro-organisms
    • [CONVENIENCE]: Easy-to-use 2-part system for cleaning and sanitizing the fresh water tank
    • [SAFETY]: Free of bleach and chlorine, leaves no smell or taste

    Product Description

    Thetford's Fresh Water Tank Sanitizer is an easy-to-use 2-part system designed for cleaning and sanitizing fresh water tanks and plumbing on RVs, trailers, campers, boats, water coolers, coolers, ice machines, refrigerators, ice chests, or any washable hard, non-porous surfaces.

    Step 1: Clean with the detergent

    1. Empty the tank and add 1 ounce of concentrated detergent solution to the fresh water tank for every 4 gallons of tank capacity.
    2. Fill the tank with water and run the diluted detergent through each faucet, shower, and water outlet for 1 minute or more.
    3. Empty the tank and rinse the faucet lines and tank by running fresh water through them.

    Step 2: Sanitize the water

    1. Shut off incoming water line and prepare a solution of 2 ounces of product per 8 gallons of water.
    2. Apply or circulate solution to wet all surfaces, allowing it a minimum contact of 60 seconds.
    3. Drain the solution and return to service by reopening incoming water lines.

    The treatment is effective even in hard water and will not leave grit or soap scum. Not a drinking water additive.

    Important Information

    Ingredients

    Fresh Water Tank Sanitizer Kit

    Report an issue with this product or seller

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