Drain rock is not one product. The size you choose changes how much water moves and how well it beds around pipe.
3/8 inch
Small and easy to work into tight spaces. Good for pipe bedding, narrow trench drains and planter drainage where bigger rock will not fit.
3/4 inch
The all-rounder and the industry standard for French drains, footing drains and retaining-wall backfill. Strong flow with minimal clogging.
1½ inch
Big voids for high-volume drainage, deep trenches and ground stabilization in wet or heavy-flow areas. When you need water gone fast, go bigger.
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