It can clear away heat and phlegm, cool blood and detoxify. Efficacy of luffa water: 1. It can clear away heat and dissipate phlegm, because luffa water is sweet and cool from the perspective of TCM dietotherapy. For people who are hot, thirsty, coughing, and coughing up phlegm, luffa water can be properly consumed to clear away heat and dissipate phlegm. 2. It can cool the blood and detoxify. For those who suffer from intestinal dryness, constipation, bleeding, hemorrhoids, bleeding, metrorrhagia, ulcers, carbuncles, and boils, proper consumption of luffa water has a good effect of cooling the blood and detoxifying, and has a very obvious effect of alleviating the above symptoms.