This research was designed to study the effect of magnetized water on the growth of the Nile tilapia fish (for 70 days) and lettuce plants (for 28 days) using different levels of magnetization intensity (2500, 3400 and 4000 gauss) in the aquaponic system. In addition, the effect was evaluated on some water properties in the system. The length and weight of fish samples, the length of the roots and leaves (the total length) of the lettuce plant, as well as the growth indicators of the fish were all measured. Some properties of the water in the aquarium , such as dissolved oxygen concentration, pH value and total ammonia nitrogen concentration were weekly measured during the experimental period. For fish samples, increases in weight and length with percentages of 26.6 to 31.9 and 14 to 17 were respectively recorded, associated with the magnetization of water in the system during the 70-day experiment. Meanwhile, an increase in the length of the lettuce plant was observed with a percentage fluctuating between 20.4 and 27.5 during the 28-day experiment. Water magnetization showed a slight significant effect on water properties in the aquarium, regarding dissolved oxygen saturation, pH and total ammonia concentration, which makes it within the safe framework for fish growth. Due to the system used, the total ammonia percentage in the biological filter witnessed a decline in the range of 11.2:15.18%, aligned with a decrease in the total ammonia percentage, ranging between 70.3 and 87.1% inside the growing bed, which made the ammonia levels return to the fish tank at their minimal level.