WHAT KIND OF POOL FILTER SAND SHOULD BE AVOIDED ?

sounds like a difficult question to answer cause this is the info I was asking for quite a while back. I was just informed "just pool filter sand" cause it's dustless. I'm now really really really thankful I didn't get the wrong stuff.
 
Mine was white. All it said was 100% pure silica sand.
 
AquariaCentral.com