aqua gems,water crystal,flower mud 1.non-toxic,ororless 2.color ... 3.SGS MSDS, EN71PART 3 Reports Features and Function:aqua gems,water crystal,flower mud"MARBLE PEARL"is a kind of ... nitrogen, phosphorus, potassium and others.2) can be used as long as 2 years3) It can absorb water up to 50-100times ...