Four trays, one tank. The long planting channels and low height reservoir enable you to make the most of your growing space. Multi-Ducts utilise the Nutrient Film Technique which provides plants with almost unlimited access to oxygen, water and nutrients in perfect balance you can expect yields typically 3x larger than traditional soil methods. Always try to make sure plants are well rooted out of the rockwool cubes before they are placed in the system to ensure they take immediately. Kit Contains: Tank Top Trays Stands Top Plates Delivery System Pump Spreader Mat pH Down pH Test Kit Instructions Recommended Air Pump: ACO6910 (an air pump is not essential to use but will always ensure a strong, healthy and disease free root system and is particularly important in the warmer months when the nutrient solution temperature rises and oxygen levels will therefore naturally be lower) Dimensions per tray: L 244cm x W 94cm Tank size: 190 litres Please note: Due to it's size, this item is only available for in-store pickup.