Help with Logistics

[SpaceMuffins]

so i need the requester chests to activate and start requesting concret when the storage this falls below a certain amount but idk how to do that

[Brathahn]

Put a wire on the inserter and the storage-chest, then set the inserter to actvate below your required amount of concrete.
This way the requester-chest will always be filled, but items are only pulled from it when needed.