Martin Pleasance Tissue Salts Nat Mur Fluid Balance 125T. Nat Mur is the tissue salt responsible for the distribution of water in the body. Symptoms become evident where there is too much water or too little water i.e. where there is dryness. Stomach juices and cell division are made possible because of this salt. Nat Mur can be used with advantage in cases when a salt free diet is recommended. . Tissue Salts are micro doses of minerals that help rectify mineral imbalances which may be the cause of many common ailments. Tissue Salts may assist the absorption of nutrients from food and supplements. May be of assistance with dehydration, hayfever, clear watery discharge often with loss of smell, watery eyes or nose, cold sores around nose and mouth, constipation and-or dry stools, dry and cracked lips or craving salty foods.