This is possibly going to sound a bit harsh....You either need to hire a property manager or not be so emotionally tied to what tenants do or don't do.

Again not trying to sound harsh but trying to  be realistic.

It simply is a corrosive chemical that crawls to wiring and pipe, just like mold did.

Rent is due on the 1st late on  the 3rd by the 5th we filing eviction...Again this sounds harsh, but I am in the business of providing solid homes for my tenants, and this cost to be able to do this.

The 5th was bought 30 year mortgage from Chemical bank.

I am a chemical engineer. 

If you aren't afraid of the soil or groundwater being contaminated from chemicals that were spilled or dumped onto the land, or disposed of in a septic system, then it sounds like the deal of the century. 

Galvanizing copper is a chemical impossibility.Projected lifespan of galvanized piping is typically projected at 60 years, but it can be less or more depending on the water quality of the source.Copper is generally projected at 80 years but same caveat.Lifespan of plastic is for all practical purposes, infinite. 

Wait till it's listed for sale or, if you can't wait, spin your wheels trying to get a hold of someone that isn't going to talk to you, and then wait until it's listed for sale.Not trying to be harsh but there aren't any short cuts to dealing with the big boys.

I will also have the mold people basically tent my house with thier chemicals.