Quote Originally Posted by flomenhoft View Post
Does anyone have an ideas what may be causing this? It isn't the grainy sand but finer. When stepping on it, it dissipates into the pool water
Others have given you some ideas, but I'll point out that what you are describing is NOT sand; sand is fine pieces of insoluble mineral or rock, and those pieces are MUCH more dense than water, so they do NOT "dissipate" into the pool water.