Backfilling trench with flinty soil

[flanagaj]

The excavated soil from the foul drainage trench is very flinty and I wanted to ask whether I could backfill the trench using said soil if I cover the foul drainage with 100mm of pea shingle or should I get someone in to screen it first.   Trying to avoid unnecessary expenditure, but also possible problems in the future.

 

 

[BotusBuild]

If you're putting pea shingle in first, backfilled with the excavated spoil. No need to screen it