Click to enlarge, hover over image to zoom

Thetford Fresh Water Tank Sanitizer

Catalog Item # 33229
This Item is In-Stock and Ready to Ship
$14.69   SAVE $2.10 (14%)
Have A Question About This Product?
4 Questions | 4 Answers
Read All Q&A | Ask a Question | Answer a Question

Like this product?
Share it!

Add Camping World item to Wish List


Chlorine-free with no bleach smell or taste.

Rid your RV water system of harmful bacteria that can make you sick. All-in-one kit includes a 24 oz. bottle of detergent solution and a 24 oz. bottle of sanitizer that cleans and sanitizes your RV holding tank and lines. Effective against staph, E.coli, Y. enterocolitica and listeria, all of which can cause serious illness.

  • Easy-to-Use, 2-Part System
    Step 1: Clean tank with detergent and rinse
    Step 2: Sanitize tank with sanitizer
  • Chemically-balanced sanitizer – even when diluted in hard water
  • Will not leave a grit or soap scum
  • Not a drinking water additive

    Below is a video showing a few of the features and uses for this item.

  • Technical Specs

    Tech Specs

    Weight: 3.4 lbs.

    Manufacturer: Thetford Corp

    Mfg Part #: 36662

    Tech Notes: Step 1: Use just 1 ounce of detergent for every 4 gallons of water tank capacity to clean inner surfaces of tank and lines. Step 2: Follow with 1 oz. of sanitizer for every 4 gallons of tank capacity. Treats a 96 gallon tank. Can also be used to clean and sanitize coolers and water hoses. EPA registered in all states.

    Related Items

    Items Selected: (0)


    Thetford Fresh Water Tank Sanitizer: Customer Reviews

    Camper's Choice Rating

    (4 Based on 9 Reviews)

    Reviewed by 9 customers


    The Taste !

    222 out of 372 people found this review helpful.
    July 16, 2006
    It seems that it works Ok, But, there was still a little taste of old water in the system, But besides that it worked Ok.
    Was this review helpful? Yes / No

    All Clean

    226 out of 453 people found this review helpful.
    July 06, 2007
    Maybe.... After following directions for Sanitizing my holding tank, I wondered how I could sanitize my hoses too. It would be nice if they included some kind of adapter to sanitize hoses! If it didn't kill my lawn, I would use it again.
    Was this review helpful? Yes / No

    Fresh Water Tank and hoses

    14 out of 31 people found this review helpful.
    May 08, 2008
    What I normally do in the early spring is put chlorine bleach into the inlet of the tank. Then lots of fresh water. I then turn the pump on to get the blend up to the faucets (NOT THE WATER HEATER). After a few hrs I start opening faucets, turn the pump on and let it all go into the grey tank which I will dump later. IM gonna try CWS water treatments for after I have flushed out the chlorine. and leave it (Them) in for a week or so, depending on if I have used the Motor Home. If that seems to work Ill use it all season until Winter. Dont forget standing water can grow lots of nasty things. I do not drink any RV WATER so my concerns are different then others. To the person who inquired into hoses, I just use one that gets hooked up to 'flush' the black tank. There are attachments that can be found to hook up to a bucket and a faucet/hose I think it works like a Venturi?? to suck up whatever you put in the bucket to help you sanitize. I am very leary of water anywhere near the black side. Hope this helps someone,,,thanks
    Was this review helpful? Yes / No

    Much Better Than Bleach!

    0 out of 0 people found this review helpful.
    May 11, 2009
    There are two things I can't stand in my RV's fresh water system: Bacteria and bleach! This product effectively takes care of both problems with none of the danger from spilling bleach on clothing or dealing with the odor of bleach. It works exactly as advertised with absolutely no odor or aftertaste. I only wish Thetford sold the sanitizer component alone, because I prefer to sanitize the fresh water system in my RV every couple of months and do a full system cleaning using the detergent component only once a year to save water.
    Was this review helpful? Yes / No

    works great

    0 out of 0 people found this review helpful.
    August 21, 2010
    1 of my friend never remembers to drain his hot water tank and the water stinks. I had to used this twice once last year and once this year and it works great. I would use this products. very easy just takes sometime about 2hr thanks thetford
    Was this review helpful? Yes / No

    Great Product

    0 out of 0 people found this review helpful.
    July 17, 2011
    I use this every year, and so far twice this year since I changed RVs. The new (used) RV came with nasty smelling tanks and hot water tank. This did the trick. Box was enough for two full cycles. Water smells and tastes great now. This is a must. It takes time and patience, but this product makes the job come out right. Too fast is no good for your health.
    Was this review helpful? Yes / No


    0 out of 0 people found this review helpful.
    July 23, 2012
    I used this product(s) this weekend as directed by their instructions as my water tank had sat over a year without being drained (dumb I know) BUT these products creates a lot of foam in the water and getting it flushed out from the tank, the water pipes in all areas of the coach is a MAJOR operation let alone using a very large volume of water. My concerns are the residual of the sanitizer and the WARNINGS in using it. If the warnings are so dire, it makes me wonder if it is safe to drink the water afterwards. I called THETHFORD, and all I got was keep flushing to remove all the foaming.
    Was this review helpful? Yes / No

    I think this is good stuff

    0 out of 0 people found this review helpful.
    June 25, 2012
    I use this every year at the beginning of the season. I ASSUME it works since I have never had the water tested.
    Was this review helpful? Yes / No

    Works great

    0 out of 0 people found this review helpful.
    August 28, 2012
    We purchased this to flush out our fresh water tank on our horse trailer. The water had a odor and I just could not use it except to wash dishes and the commode. I flushes as it says, but had to rinse an extra time. Still had a little foam the first we went camping, but not it is great. No more odor. Thanks
    Was this review helpful? Yes / No

    Q & A

    Product Question & Answer

    4 questions : 4 answers
    Expand All
    My fresh water holding tank is 250 gallons, how many do I need to purchase?
    1 answer(s)
    can this product be added to the fresh water or is there a product that can be added to fresh water?
    1 answer(s)
    Where can I find a store that carries this product???
    1 answer(s)
    Please provide MSDS
    1 answer(s)

    Good Sam Camping World Visa
    Need help? We're here for you
    chat now