BACKWASH SYSTEM, BACKWASH METHOD, AND BACKWASH PROGRAM

To provide a backwash system, a backwash method, and a backwash program capable of improving effect of washing in backwashing.SOLUTION: A CPU pumps up underground water from one of a first well and a second well, and delivers the underground water to the other well through a flow channel (S24). Further, the CPU performs intermittent backwashing for washing the first well or the second well by allowing the underground water to intermittently flow to an opposite direction (S45). When backwashing is performed, the underground water flows intermittently, therefore, compared to the case where backwashing is performed at a constant flow rate, the water flow is changed and the effect of washing is improved.SELECTED DRAWING: Figure 6 【課題】逆洗における洗浄の効果を向上させる逆洗システム、逆洗方法、及び逆洗プログラムを提供する。【解決手段】ＣＰＵは、第一井戸と第二井戸とのうち、一方の井戸から地下水を揚水し、流路を介して、他方の井戸に地下水を排出する（Ｓ２４）。また、ＣＰＵは、地下水を逆方向に断続的に流して第一井戸又は第二井戸を洗浄する断続逆洗を実行する（Ｓ４５）。逆洗を行う場合に、断続的に地下水が流されるので、一定の流量で逆洗を行う場合に比べて、水流の変化が生じ、洗浄の効果が向上する。【選択図】図６