Sealed sump pit getting moldy -

[l8_apex]

Keep a UV light running in the hole. It should work if the light can directly hit everywhere.

 

[JoeWras]

Keep a UV light running in the hole. It should work if the light can directly hit everywhere.

That's not a bad idea.

Ever spend time in a computer lab that is cooled by chiller units, and see them get serviced? These all have the lights. Helps avoid Legionnaire's problems.