8 pads of SAP CHEM (Tm) &ndash; iPAD; Root Feeding System, Super Absorbent Polymer, Moisture Trap for You Indoor, Outdoor Potting and Basket Plants Set of 8 packs; Size (2 each): 3.53.5, 4.7 X 4.7, 6X 6, 8X 8 different sizes for small to large pot. SAP CHEM  iPAD - Water Reservoir and Soil Aeration - Slow release properties. Water plants for weeks while away on vacation. Lets Soil Vigor do the bulk of your watering work for you. And keep your plant healthy. Reduces watering frequency by up to 50%.Reduces soil compaction and increases aeration. Stores water and nutrients in the root zone, Maximize time intervals between irrigation cycles. Environmentally safe. Non-toxic. Biodegradable.