Water-retaining agents utilize highly absorbent resins, which are functional polymers with exceptional water-absorbing capabilities. They are non-toxic and harmless, capable of repeatedly releasing and absorbing water, thus in agriculture, they are likened to "miniature reservoirs." Additionally, they can absorb fertilizers and release them slowly, enhancing fertilizer effectiveness. High-absorbent resins are widely used in agriculture, forestry, horticulture, building materials; in industry, they are extensively applied in petrochemicals, cables, papermaking, sensors, fire-fighting equipment, fiber products, cosmetics, food preservation, and expandable toys.