Flushing Whirlpool Tub Jets
from Kohler Homeowners Guide - Bath Whirlpools

NOTE: Flush your whirlpool system twice a month or more depending upon usage, as described in the "Flush System" section in this manual. Do not allow the water temperature in the whirlpool to exceed 104°F (40°C).

Repeated use of personal care products containing oils can damage plastic whirlpool components. Do not use heavy, vegetable-based shampoos or bath oils. Whirlpool hydro-massage action can cause even a small amount of bubble bath, bath soap, shampoo, or bath oil to foam excessively. For this reason, please do not use these products during whirlpool operation.

• Turn the jet trim rings fully clockwise to reduce air induction.
• Fill the whirlpool with hot water to a level at least 2" (5.1 cm) above the highest jet.
• Add 2 teaspoons (10 ml) of a low-foaming, powder automatic dishwasher detergent and 20 ounces (590 ml) of household bleach
  (5% - 6% sodium hypochlorite) to the water.
  Warning: Do not use dishwashing liquid for hand-washing dishes as it will produce too many suds.
• Run the whirlpool for 5 to 10 minutes. [Use a cleaning toothbrush and brush out the inside of the water jet holes.] Turn off the
  whirlpool and drain.
• If desired, rinse the bath surfaces with water.
• Rinse the surfaces of the jets, faucet, handrails, and drain, and wipe them dry with a soft cloth.