I use pool filter sand, but only from one pool place. I checked multiple, some only have brown sand, while others have crushed quartz pure white. I like the pure white, looks much better especially under moonlighting. the difference in color is night and day, but hte same price no matter where you go. I paid $9.99 per 50lb bag. 2 bags in my 75g allowed for some scaping to make it look neat, but I probably could have gotten away with 50lb for that. It's definitely worth it for the appearance, mine looks great.