Kohler K-5402A-0 Homeowner's Manual page 17

D) Exchange Deodorizer Block
Please replace deodorizer block when poor deodorizing performance or strange smell occurrs.
Deodorizer block exchange steps:
Remove deodorizer screen and deodorizer block.
After exchanging deodorizer block, re-install back to the toilet.
Deodorizer block bracket
Note: When taking deodorizer block off, please do not insert finger or other objects into deodorizer block cavity.
This may damage the fan or other components.
1274372-A05-B June 2016
Deodorizer block
17
Screen
Kohler Co.