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Choose Options Compare Quick view GROW!T GMC10L Clay Pebbles 10 Liter Bag, 4mm-16mm Campbell Hausfield Now: $14.59 Was: Hydroponics users have found out that clay pebbles are an excellent way to increase their yields! Extremely stable in both pH and EC Made from 100% natural clay Strong structural integrity means... Now: $14.59 Was: Choose Options Compare Quick view Qty in Cart: 0 Price: Now: $14.59 Was: Subtotal: Choose Options