$50/general clean (they do a thorough cleaning including the filter and all); $150 for a full drain, deep clean and fill.The downside with this approach is continually pounding our well.

Probably they are older or distressed properties in undesirable neighborhoods certainly they can be found. 

Regularly treat the line with a product like this: https://www.amazon.com/Roebic-FRK-1LB-Foaming-Killer-1-Pound...Save up money because you will need to replace that line eventually.

A very seasoned investor pounded it in my head years ago, when it comes to negotiations, "never say the first number." :)good luck 

You are being penny wise and pound foolish. 

So I'm in a pretty undesirable situation right now.

Ten inexpensive properties in the Midwest will be in undesirable areas and may lose money…..

A combination of mortgage notes for cash flow and desirable properties in high appreciation areas (not cheap, undesirable properties in the Midwest.)

It may help you dispel the myth that people with disabilities are a bad risk, undesirable as tenants, or are likely to have undesirable service animals.In some jurisdictions, you can't discriminate on "source of income".

Tell them to go pound sand.