... ,odorless,reusable,biological. 2.preserve water and store nutrients SAP for agriculture, water absorbent polymer:can swell hundreds of times in water ... is able to absorb, store and release water and nutrient for promoting plant growth even against pressure. It is widely used ... soil or substrate to preserve water and nutrionts,small plants, agriculture and non-soil transportaion. There are 4 sizes,WRA-0 ...