Pond Care’s Aquatic Planting Media is an aquatic plant soil comprised of a unique blend of natural minerals, including zeolite, which provides a clean, easy to use planting media. Aquatic Planting Media securely holds the plants in the pot so plants can form a strong root system. With the addition of zeolite, Aquatic Planting Media has the added benefit of high nutrient holding capacity. Zeolite is a naturally occurring mineral having a honeycomb-like layered crystal structure. The zeolite acts as a resevoir for nutrients which are slowly released as needed by the plant. Aquatic Planting Media will also remove nutrients from the pond water, concentrating them in the root zone for uptake by the plants. Will not change pH or color of pond water.