I sent you the package translation. Did it help?
gabeszone247 said:The stuff you got is an ancient sea mud that more than a 1000 years old and contains many minerals. Is says don't wash or rinse off, and you can add it to your tank or filter. It say you can add as much as you would like into your tank and it wont raise your PH. It can last 2-3 months depending on your tank, and then you have to replace it.
I hope this helps,
Gabe,
Forgot one thing if you see any shells in it leave it, because its good for your CRS.