Twenty square meters is too small. Last year, the products with a daily output of 200L were not enough, and they needed about 30 square meters, while those with a daily output of 500L needed 40 square meters. The equipment is made by different manufacturers, and the product quality is somewhat different, but the comprehensive cost performance is still cheap, because the price can be doubled. Some sell 60,000 to 70,000 yuan, and some can buy134,000 yuan (200L).