I watched a few vids online and did what they said, but it took me forever, i mean like an hour plus while flushing the system out to get the color of the water to look a lot more like water vs the color of my paint.  

The sump regularly flushes the water out, so that is far better than it was.

I could go on and on, lots of my family is in Real Estate, but from time to time, someone wants to sell and if I am flush, I usually make a purchase. 

Anyone know how long it takes for them to flush out?

For example, if the main drain has a blockage and filled with water, and someone unknowingly flushes the toilet, the positive pressure created by the flushing action had no where to go due to the blockage, in a conventional atmospheric vent the positive pressure can just be relieved, but not with an AAV.In some jurisdictions, they allow you to upsize the drain line in order to allow part of the drain to serve as a vent.Also, try to explore an option where a conventional vent can be implemented in the island, but creatively disguised as a support beam, a decorative pole or something.

Educate the tenants to use septic safe TP, don't flush certain products, and you (not the tenant) should get the tank pumped every 2-3 years, or whatever the installer recommends.

For me it’s first person who can pass a back ground check by a third party, it is not a perfect system but does flush out a lot of trouble.I rented to 2 young men who passed a back ground 4 years back they did about $2500.00 damages smoked a lot of weed to the point I had to spray a degreaser on the wall then Killz it then 2 coats of paint.

I am wondering if I can flush the screws, tape the joints and finish with a deeper texture, thus salvaging ceiling wallboard.

In all the multi-unit building I've replaced older 3 & 5 gallon toilets with 1.5 gallon flush toilets, to reduce the amount of water consumed in each building.

So those things stayed in the drain for OVER 2 years because before I lived here the house was a foreclosure and it had taken some time to renovate.So I always stress to my tenants not to flush things like baby wipes, but even so, that kind of stuff can stay in the drains.