The second cycle takes the water from the top tank (1), through the pools (2), and through the three garden walls (3).In the garden walls, the water is purified by the vegetation sitting in the pockets in the wall.After the passage of the walls, the water is collected in a large underground cistern (4), for a subsequent transportation by a solar-driven pump to the top tank (1), to the next round through the system.The turnover of the larger system is about 50 days, which means that the same water will pass the plants in the walls about seven times a year.For its function, the system needs only two solar driven pumps, one in the first cycle system (1), and another in the second cycle. The size of the pumps are almost the same. The difference in cycling time is because of the difference in water volume of the two cycles.
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