This project investigates the application of ion-exchange treatment using sodium zeolite for recycling greywater in a sustainable aquaponics system, an integrated approach combining fish culture and soilless plant cultivation [3,4]. A laboratory-scale prototype is developed in which simulated greywater is first pre-filtered through a multilayer medium consisting of stones, coal, cotton, sand, and tissue to remove suspended solids and visible impurities [3]. The pre-treated water is then passed through sodium zeolite to reduce ammonium concentration and water hardness, improving its suitability for biological reuse [1,2]. The treated greywater is circulated in a closed-loop aquaponics system, where fish waste provides essential nutrients for plants grown on cardboard sheet, while plant activity contributes to oxygenation and improved water quality for fish survival [4]. Key water quality parameters (pH, turbidity, ammonia, nitrate, nitrite, and hardness) along with fish survival and plant growth responses, are monitored. Water circulation is maintained using a solar-powered pump to enhance energy efficiency and system sustainability. The treated greywater is evaluated to assess its safety and suitability for use in aquaponics by monitoring key water quality parameters and observing plant growth and fish survival within the system. The expected outcome is that properly treated greywater will support healthy plant development and maintain safe conditions for fish, demonstrating its potential for reuse in integrated aquaponic systems. This study highlights the concept of “greyponics” as an innovative, low-cost, and environmentally sustainable approach to water conservation and food production, particularly suited for water-scarce urban and rural environments.