I now self-manage.I have now paid to have the garbage disposal side of the kitchen sink snaked 4 times, each time giving them verbal and/or written preventative instructions and told them to use it minimally (I've already decided to remove it before my next tenant, if not sooner). 

another property I know of had snakes in the crawl space Lots of them. 

They only removed them once the water was backing up and they tried to snake (and snag) it (right before the plummer came). 

I think bashing your competing gurus is a well established practice in the snake oil industry.EDIT: I just checked out the site.

Rich stole my thunder as I wanted to post this success myself...

James, don't fear technology, embrace it with your heart, but firstly, with your wallet.I was led to this link by looking up this ken guy by this interesting link:https://www.biggerpockets.com/forums/61/topics/73148-investment-statistical-analysisbummer that they went the snake oil route vs a potentially a "higher and better use" (if not highest and best) of the concept in the REI market.

Basement had snakes, mold, 8 cats, and piles of ****. 

And many people think these devices are snake oil and that the only fix is a new leach field, which costs several thousand dollars.  

We're like snakes swallowing our own tails here, just going endlessly in the same circle. 

Simple remove the overflow cover and use a small snake to remove anything that may be clogging the downstairs tub drain.I suggest you invest in a snake that can be advance with an electric drill.This is your first step before calling a plumber.