Septic Tank systems usually need an enzyme additive 1-2/ year, but repeated   drain problems usually indicate a broken pipe or roots.but, in today's   technology, they can run a camera to diagnose correctly, and can save thousands   over digging it all up to (blindly) diagnose (Hundreds $$ for   camera, I suspect) (Guessing 1-4 man-hours plus equipment fees).    
   
  The other septic tank potential disaster can be a running toilet, or leaky   faucet causing tank overfill/ overflow, especially in rainy weather when ground   saturated, or when you went out of town for a week on vacation and (unknowingly)   left a toilet running.  
   
  Bath "wipes" are also a plumbing disaster, especially w/ septic.    London, England recently found a septic "wipe" clog in one of their ancient   systems that was the size of an 18-wheeler.... they do NOT easily dissolve,   despite label wording 
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