Catchment trays are used in hydroponic systems to collect excess nutrient solution that drains from the plants or the system itself. These trays are typically placed under the pots or containers to prevent the nutrient solution from spilling onto the floor or other surfaces. Catchment trays are available in various sizes and materials, such as plastic, metal, or fabric. They can be designed to fit a specific hydroponic system or can be used as a universal tray for different types of systems. Catchment trays are important to ensure that the nutrient solution is not wasted and can be recycled back into the hydroponic system. They also help to prevent water damage or other issues that can arise from excess water and nutrient solution.