High-Performance Bedding (HPB) is limestone chips you can easily use for many DIY projects. It is 3/8" clear stone with no fines and contains only pea-size pieces of limestone. HPB looks similar to limestone screening but has been washed clean, and it makes a whole lot of difference. Limestone screenings wick the water away, especially if compacted. HPB, even in a well-compacted state, passes the water very well, as it consists of angular and not too fine particles
