I have a home made garden hose/copper tube CFC at 25' and it works well.
IMO there is no issue with the cd break going into the primary, the beer is still great and crystal clear when packaged.
I have no pump either and the CFC is faster when the ground water is colder obviously.
As for cleaning and sanitizing, when done chilling I flush with boiling water, use an air gun to blow out the moisture and cap the ends.
Prior to chilling I spray star San in it. When ready to chill I hook it up, let some of the boiling wort pass through into a separate vessel, then turn on the cold water and go to primary. I lose maybe a cup or two of wort but this method has served me well with no issues or infections