oregonian;3053161; said:don't do play sand, make sure its pool filter sand. play sand is really fine and kicks up easily even when properly rinsed.
as for adding what i did was after rinsing i would put it in plastic bags so i could get it close to the bottom to dump it. just need to make sure to shut off pumps temporarily just in case you lose some higher up.
but also need to add most important, patience. seriously do not jump ahead and figure the filters will clean up the rest. some of these finer particles will amaze you at their ability to remain suspended but not get sucked up by filters. i don't know if they make it through or around media but if the sand is not rinsed well your going to think sand sucks, which it most def does not.
invisyblegypsey;3060978; said:pool sand or if you need black you can get black blasting sand
http://www.materialsinc.com/black-magic-sand-blasting.htm