According to Hulda Clark , floating bm's means you're not digesting your food well enough. In her book, The Cure For All Diseases is says..
"Does the stool float? If so, it must be lighter than water and contain fat or a great deal of undigested material."
"Absorption of fat and calcium depends on bile mixing with the food. When fat isn’t absorbed, it stays in the intestine. Fat is lighter than water; it makes the stool float. Feces should not float. When the stool floats you can assume that calcium isn’t being absorbed either, leaving the blood in a deficit which will be taken from the bones." Type in the curezone google search "digestion"