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yes
grow roots
Yes, termites can live in sewer lines.
Root damage can cause extensive damage to your home itself. Once the sewer lines have been compromised, many problems can occur within the home. The water supply can be interrupted and floor drains and toilet can back up, potentially causing flooding or damage to appliances. No type of sewer line is immune to roots. Clay pipes, the most common kind of pipe in older water and sewer systems, are the most susceptible to root damage. Roots will penetrate any crack, hole, or poorly sealed joint in a sewer line. Concrete and PVC pipes are less susceptible to root intrusion but are not root-proof. Once roots penetrate the line, they can exert considerable pressure on the pipe, which then must be repaired or replaced.
No.
If you could keep the salt in there yes, the problem is that it washes out as soon as you put it in there so no it would not keep roots out of the sewer line.
Only if the water pipes are leaking.I know that the roots of the Italian Stone Pine can grow thru sewer lines. It also caused pavement heave and a split in our retaining wall.
Of course.
4" is the standard house sewer main
You DON'T
Any tree that has long roots.
For hard materials such as roots compacted mud, rags a cable has to be used and in no case less then 3/4" when roots are encountered