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How much 4 yards of dirt will cover depends on how deep you want the soil to be. In general, a yard of dirt will cover 324 square feet for a 1-inch depth or 100 square feet for a 3-inch depth. Therefore, you can expect 4 yards to cover between 400 and 1,296 square feet if you keep your soil depth between 1 and 3 inches.

If you hire a professional landscaper, you could expect to pay between $90 and $660 to install three cubic yards of river rock. (That’s based on the average river rock installation cost of $30 to $220 per cubic yard.) However, the exact price depends on the kind of river rock you choose. Crushed limestone and riprap are some of the more affordable options, while boulders and Arizona river rock are pricier.

Food-grade diatomaceous earth is a natural product that comes from diatoms—fossilized aquatic organisms from tens of millions of years ago. Food-grade diatomaceous earth is considered "natural," while pool or filter-grade diatomaceous earth has been treated and transformed to have higher crystalline silica content.

Using sand under stepping stones can be beneficial in certain situations. Sand can help level the ground and provide stability for the stepping stones, especially if the ground is uneven. It also allows for minor adjustments during the installation process. However, sand may not be the best choice for all environments. In areas with high foot traffic or heavy rain, sand may wash away or become displaced, leading to an uneven surface. In such cases, a more stable base material like gravel or crushed stone is preferable. Consider your specific landscape conditions before deciding whether to use sand under stepping stones.