Mechanical joining of pipe for an earth loop is never an accepted practice. The use of barbed fittings, clamps, and glue joints is certain to result in loop failure due to leaks. Research has proven that loops have no adverse effect on grass, trees, or shrubs. Most horizontal loop installations use trenches about six inches wide. This, of course, will leave temporary bare areas that can be restored with grass seed or sod.
Vertical loops require little space and result in minimal lawn damage.
An earth loop will reach temperatures below freezing during extreme conditions and may freeze your septic system. Such usage is banned in many areas. It's not recommended. Nonprofessional installations may result in less than optimum system performance. I have a pond nearby.