PROBLEM TO BE SOLVED: To provide a pipe washing method capable of washing a pipe passed with a liquid fertilizer without harming a plant in a plant factory performing hydroponics.SOLUTION: In a pipe washing method washing a pipe passed with a liquid fertilizer in a hydroponic device performing the hydroponics of plants and including a step washing the pipe by passing washing water in the pipe, the washing water contains a liquid and a solid, the liquid has a property capable of dissolving contamination into the liquid, and the solid has a property capable of peeling the contamination and a property capable of being dissolved in the liquid.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】 水耕栽培を行う植物工場において液肥が通る配管を、植物に害を与えずに洗浄できる配管洗浄方法の提供。【解決手段】 植物を水耕栽培する水耕栽培装置において液肥が通る配管を洗浄する配管洗浄方法であって、 前記配管に洗浄水を通過させて前記配管を洗浄する工程を含み、 前記洗浄水が、液体と固体とを含み、 前記液体は、前記配管内の汚れを溶解可能な性質を持ち、 前記固体は、前記汚れを剥離可能な性質と、前記液体に溶解可能な性質とを持つ配管洗浄方法である。【選択図】図1
