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.

.80 gallons per flush.  

If the secondary drain is piped to just  'outside somewhere' - the water will never be noticed until after Too Late comes.Second;  hard water requires WH maintenance:  the water heater tank should be flushed, by opening the drain valve wide open until the water runs clear, every 4 or 6 months.  

Also I like my sides flush with the cabinet so there is no cut end to contend with and would have used a bullnose end piece instead of the metal edge. 

Hopefully that correction isn't flushed further due to external/foreign events (like Deutche Bank or the host of EU countries drowning in debt).

If you have a dishwasher ask your tenant to run a cycle at least once a month and perhaps flush the toilets or whatever needs to be done to keep the system functional. 

I hired him because of refeerral and now he says he couldnt slope it becuse that was not possible but has changed the line and I owe him money where as my pipe is still backing up every time we flush. 

Of particular concern are famine products, condoms and plush toilet paper being flushed down the toilet.

Wish I had so many 401ks flush with cash to do that with.

At the end of our countertop the granite lines up flush with our bottom cabinetry, which is about 1/8 of an inch exposed.