I have a plan for my front yard that I am working on.
For phase 1, I have dug a trench and laid a lateral PVC line for a drip system.
In the future I plan to lay another line for the sprinklers, and then another for the trees. And maybe one more to pull landscape wires.
Since it's a long term project, I wanted something to fill the trench with. So that when I want to install additional lines (reuse the trench) it is easy to do. It's a pain to have to re-dig the trench every time.
I was thinking of using pea gravel, but was not sure if the sharp edges of the gravel would damage the PVC pipe?