Drinking Salt Water is well-known as a potent natural remedy for sore throat, weight loss and good digestion. A saltwater flush is used to cleanse your colon, treat chronic constipation, and help detox your body. It became a popular trend as part of the Master Cleanse detox and fasting program. A saltwater flush involves drinking a mixture of warm water and himalayan pink salt. Drinking salt and warm water has a laxative effect.