Although pentasodium phosphate (STPP) was a detergent builder with good washing ability it was also one reason of which induce eutrophication in close or semi-close water area. So, to search a substitution of STPP is becoming ever important. Layered sodium disilicates (Na_2Si_2O_5) have good ion binding capacity, provide appropriate water alkalinity; and may cooperate with other composition in good method, They were considered as excellent non-phosphate detergent builder and have good prospect for substitut...