How to Remove Black Flaking in a Jetted Bathtub

By the time you see any type of flaking coming out of the jets of a whirlpool bathtub ... it's already too late. The flaking are remnants of bacteria, mostly harmful, condos that have now decayed and are ruining your visual of a relaxing spa bath.


  1. 1
    Don't use bleach. First things first, we don't use bleach because over time it will breakdown gaskets, bushings, etc. We also won't use any dishwashing detergent since it will put a coating layer on the flaking we are trying to remove.
  2. 2
    Fill the jetted tub up with warm water 1" about the highest jet
  3. 3
    Add a non toxic bio cleaner to the water per the instructions on the cleaning product label, normally it is 1 teaspoon or 1 capful, depending upon the bio cleaner
  4. 4
    Run the jets, turn off the air valve if you have one, on high for 10-15 minutes. This allows the bio cleaner to scrape off the gunk (flakes) that are solidified on the pipe and jet walls.
    • Bio Cleaners use special properties that are ecological, green and non toxic and have the capability to eradicate bacteria, algae, mold, mildew, dead skin, soaps, and other gunk in the piping and remove them to the sides of the tub.
  5. 5
    pipe and jet gunk flaking after bio cleaning
    When you have completed the 10-15 cleaning cycle, remove 2 inches (5.1 cm) of water, clean the "ring around the tub", refill with 2 inches (5.1 cm) of water and repeat the process.
    You will have to add more bio cleaner in as well.
  6. 6
    To maintain a clean jetted tub, you really need to clean it once a week, preferably after a bath to save on water.


  • Use paper towels or a cleaning rag to wipe the gunk off the tub sides
  • Most bio cleaners have clarification properties in them so use the water in the tub to wipe down the bathtub
  • All bio cleaners are non toxic and septic/sewer safe


  • Even though bio cleaners are non toxic and safe to touch with bare hands and skin, it is advisable to use rubber gloves when cleaning the gunk "ring around the tubs"

Sources and Citations

  • You can find more about bio cleaners on Amazon and querying a search engine for "cleaning jetted tubs"

Article Info

Categories: Bathroom Cleaning | Swimming Pools Spas and Hot Tubs