Maximum Yield USA 2015 April | Page 148

expanded clay pebbles Some MAJOR Do’s Rinse and Soak Before Use: For those familiar with expanded clay, the simple practice of rinsing to remove debris and dust from the factory may seem obvious. Rinsing will provide a clean start that won’t cause murky problems in your reservoir down the road, and the lesser-known process of soaking the pebbles is crucial to truly maximize yields with expanded clay. Soaking for 6-24 hours, preferably with an air stone, before planting allows water to percolate through the clay’s micro-pores, completely saturating the media. After an adequate soak, you will notice the media is heavier. In an airy media like expanded clay pebbles, you want to ensure the roots don’t have to travel too far to find water, or wilting will occur. As a general rule of thumb, make sure a 3-in. radius of pebbles around your plants is always fully saturated. “As a general rule of thumb, make sure a 3-in. radius of pebbles around your plants is always fully saturated.” Add a Small Amount of Nutrients: After rinsing the media, place it in a container and fill with a nutrient solution with an electrical conductivity of no more than 0.4. If you don’t have a ppm/EC meter, use your base grow nutrient at one-quarter strength. You may also choose to use a hydroponic plant enzyme to ensure a clean transition when you transplant. 146 Maximum Yield USA  |  April 2015