For the play sand; I didn't have a very large tank to fill, so I took a large bucket outside, filled it 3/4 with sand, then rinsed it with a hose. To do so, I filled the bucket with water, moved the sand around with my hands, then dumped the dirty water off the top. I repeated this at least 10 times, and when I eventually put it in my tank, the water was clear in less than 15 minutes.
Keep in mind that sand can be difficult to clean, since syphons just suck it up and that waste collects on the top, dirtying the color. After awhile, I wasn't a fan and changed it out for fine gravel. Just my experience, I know quite a few people like it