We specialize in the calls where another plumber was unable to restore flow or fix an issue at a customer's house. Texas APS has all the equipment needed to clear any drain stoppage and will camera to explain why the stoppage occurred. Sometimes it is simple, like too much toilet paper flushed at once. Other times, there are bigger issues like a broken pipe or belly that hold debris that eventually stops the flow.
One job encountered was a house built on top of a septic tank. No lie, customer didn't know it and all the bathrooms were plumbed into it. Needless to say, we had to jackhammer into the tank to clean out 30 years of gunk before we could begin repiping their bathrooms properly. Plumbing inside an old concrete septic tank was unique, but we did what was necessary to fix the customer's plumbing.