¿Dónde está la diferencia de precio del mismo producto?

¿Dónde está la diferencia de precio del mismo producto?

For SAP, there are 3 grades in the market, I make a brief introduction  as follows:  1,Hygiene grade SAP , it only can absorb the water, cannot release the water, the price is around...; 2,sodium based SAP agriculture grade, it can absorb and release the water; with the using quantity increased in the soil, the soil will become hard, the price is around; 3,Potassium based SAP, it can absorb and release the water, also can rich the soil, the price is around ...Now we are focus on the production on potassium based SAP,our technical support is from QUST AND CAS, we have already developed 5 product series to meet different clients` requirement. and our sales quantity is Top1 very year since 2011. Considering from the whole eco-system, we recommend to choose potassium based SAP; Meanwhile, if sodium based SAP is requested by the market, we also can customize for you.