I am looking to change from gravel to sand in the next couple of weeks. Initially I was looking at a black sand but I have heard so many negative reports of either colour leaking out, the particles being too fine and damaging equipment etc I thought I would go for pool filter sand as I have heard a lot of people from different forums use it. I was wondering if all pool filter sand is the same or if I have to buy a specific type. Unless someone can recommend a good heavy black sand I don't have to worry about my equipment with then I may reconsider . thanks in advance for any input