Dies this indicate a leak in my DE filter?

I’ve been getting this almost sand like stuff on the surfaces of the pool. The vacuum has it in the bag and as you can see on steps its like sand colored. It’s sort of gritty like sand but sort of dissolves if you rub it between your fingers. Pretty sure its DE. What else could it be, right? so where could it be leaking from most likely? I did change the filter fins or whatever theyre called about 4 years ago. Filter is original to pool which is 2003 I think. If not the filter fabric what else could should I look into? Thanks all.

Just realized it says dies instead of does in title sorry. Auto spell on my phone stinks.

Good afternoon. Please click here to view a guide we put together called “Getting DE Powder in Your Pool?” that may assist in confirming the issue.