I am replacing the sand in my Triton II, TR60 sand filter with ECOsmarte Glass Pack. I found this media to have specifications as good or better than the alternatives and was able to acquire if for the same price as sand including shipping. The question I have is whether I need to cover the laterals with pea gravel when using this media. Does anyone have experience with this? Should I cover the laterals with pea gravel? Where is a good source for pea gravel, no pool supply place here seems to carry it for pool filters.