Choker layer
Revision as of 22:18, 22 November 2017 by Jenny Hill (talk | contribs) (Created page with "<poem> A choking layer of ≥ 100 mm is the recommended method to prevent migration of finer filter media into an underlying reservoir of Reservoir gravel|coarse aggrega...")
A choking layer of ≥ 100 mm is the recommended method to prevent migration of finer filter media into an underlying reservoir of coarse aggregate.
Suitable materials include:
- Pea Gravel
Pea gravel or crushed stone screened between 5 - 15 mm, and washed, free from fines.
- High performance bedding (HPB)