There is a difference between a professional ozone shock treatment and a small undersized ozone machine.

Appropriate is a bit subjective because a single family home may be okay with crappy water quality and have a basic treatment setup to take care of it.  

Plus it would be an eye sore to GOOD tenants. 

Though, after a couple of treatments, the floor should be in a condition where you could paint and seal it.

Not to mention the eye sore from other neighbors and all the possible complaints.

The idea of taking the neighborhood's eye-sore and flipping it into a grand profitable property instantly hooked me.

Goal is to use some of the equity "cash" to pay for the rehab.First, if you are buying with the intent to rehab and then sell (or flip) the transaction will not qualify for 1031 Exchange treatment. 

I now provide custom blinds and forbid them to be altered, after explaining to a young couple why beach towels, sheets and a tie-die flag with a marijuana leave in the center were not appropriate window treatments.  

You can go with the chemical treatment which is cheaper to get rid of them but you have a greater chance of recurrence.  

Therefore, if you purchased the property just to flip it, then it won't qualify for 1031 exchange treatment.