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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.

Replace organic mulch every one to two years, depending on the variety. Wood chips and straw, for example, will last a couple of years, while grass clippings and pine needles need replacing every several months. Inorganic mulch—such as rock and rubber chips—can stay in place for up to four years, depending on erosion and general garden upkeep. 

A base layer is typically required when installing artificial grass, and the specific materials depend on the surface where the turf is being placed.

If you are installing artificial grass over soil, you should lay down a sub-base and a weed barrier.

• Weed Barrier: A fabric weed barrier, weed membrane, or geo-textile paper is essential to prevent weeds from growing through and damaging the turf.

• Sub-base: This layer provides drainage, support, and prevents the turf from sinking. Common materials include a mixture of gravel and sand, such as crushed miscellaneous base (CMB), decomposed granite, decomposed limestone, or a specifically mixed road base. Other options include silica sand and granite sand.

If you are placing turf over a hard surface like concrete, you can often skip the sub-base and use a padded underlayment or shock-absorbent material like astro-cushion for comfort and safety.

If you are unsure which materials are best for your specific project, it's a good idea to consult with an artificial turf installer.