Inside or out?
Thanks for the advice. I will probably set one up once I get time.What is it you need help with?
Suggest you fill and test with a couple of fish. You will know by tomorrow.
If you did have issues (unlikely) then any oil or petroleum based liquids will easily be removed with detergent and warm water (scrub ).
Organophosphate pesticides easily removed by dilution, very stubborn residue can be chemically filtered with carbon as the molecules a really long chains.
I have no contact with herWell...if she had them installed during the house construction, it seems likely that they were new at that time, and that she was planning on using them for survival preparation, i.e. food, water, etc. So based on that train of logic you'd be pretty safe. Do you have any way to contact her and ask?