1.   A shuttle drain line overheated, forcing the astronauts to use an alternate method of disposing of excess water produced by electricity-generating fuel cells.

2.   Discard grease and coffee grounds in the regular household garbage instead of the kitchen sink where it can clog drain lines.

3.   Every time we flush the toilet in the room above there is a lot of noise in this drain line.

4.   I then disconnected the drain line where it goes down through the floor below the trap.

5.   If other drains are stopped up or slow running, the problem may be in the main vent stack or a large drain line.

6.   In some cases, it may push the obstruction farther down the drain line.

7.   Sooner or later, the drain lines in plumbing systems develop clogs.

8.   The sink drains out OK, but I tried cleaning out the drain line anyway, using a chemical cleaner.

9.   They can damage the disposal and clog drain lines.

10.   This is not unusual with plastic drain lines that are exposed.