Hydro Clay Pebbles are baked clay balls made by baking and tumbling natural clay at high temperatures. As a result, they are super lightweight and porous with high air content. Hydro Clay Pebbles have a neutral pH value, are fungus free and will not rot making them a great potting alternative to soil. They also absorb moisture when soaked in water. Unlike soil, the hydro balls make it much harder for Gnats to infest your indoor plants. This is what makes them an ideal growing medium for selected plants, a topsoil dressing or a drainage device for plants growing in potting soils. Directions for Use Read instructions on pack before use. Absorbs moisture & provides superior drainage in pots with soil. pH neutral, fungus free and will not rot. High air content for excellent root growth. Store Pickup & Returns Store Pickup: We currently do not ship/post any plant life or oversized + bulky products such as pots. These items are Store Pickup (Click & Collect) only at our store in Warrandyte, VIC, 3113. Secure Online, Pickup Later with our store pickup option on the cart page. var acc = document.getElementsByClassName("accordion"); var i; for (i = 0; i < acc.length; i++) { acc[i].addEventListener("click", function() { this.classList.toggle("active"); var panel = this.nextElementSibling; if (panel.style.display === "block") { panel.style.display = "none"; } else { panel.style.display = "block"; } }); }