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HIGH PRODUCTIVITY Compared to traditional soil cultivation, soilless cultivation with nutrient film technique and 36 planting sites can produce more plants, so you can sow more and harvest more. Food grade hydroponic growing systems that use PVC U pipes are safer and healthier than other options, resulting in greater safety.; Product description Specification: Layer quantity: 1 layer. Number of tubes: 4 Number of construction sites: 36. 2.5\; Product description Specification: Layer quantity: 1 layer. Number of tubes: 4 Number of construction sites: 36. 2.5\; Specification: Layer quantity: 1 layer. Number of tubes: 4 Number of construction sites: 36. 2.5\