This video will show you how to flush the fill valve in a KOHLER low-profile one-piece toilet in under 10 minutes.
All you will need to perform this maintenance is a plastic cup.
Flushing the fill valve may be able to resolve the following issues with your toilet:
The toilet is not refilling
The toilet is refilling only partially and then stopping
The fill valve is making noise during the refill process
Water is frequently dripping into the toilet bowl