Do not use the system as a disposal route for paint, solvents or other unsuitable chemicals. They differ from the waste the unit is designed to handle.
What the observation means
A basin connection does not make every liquid acceptable. Chemical compatibility and environmental disposal rules are separate from whether the pump can move water.
A useful next step
Use an appropriate waste-disposal route. If a chemical was introduced, stop using the unit and retain the product label for advice. Do not mix products, open the casing or run extra hot water to flush an uncertain chemical through.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.