You should strongly consider using polymeric sand for outdoor stone pavers. While regular sand is cheaper, polymeric sand contains special binding agents that harden when activated with water. This locks the pavers in place, completely prevents weed growth, and stops ants from washing away the sand during heavy rain.

Polymeric Sand vs. Regular Sand

Feature Polymeric Sand Regular Paving Sand
Weed Prevention Excellent (Hardens like cement) Poor (Seeds easily take root)
Erosion & Rain Washout Resists heavy rain and power washing Washes away easily over time
Ant Infestation Stops ants from digging nests Ants frequently displace the sand
Cost Higher initial cost Very cheap

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