Water-retaining agents utilize highly absorbent resins, a type of functional polymer material with exceptional water absorption capabilities. They are non-toxic and harmless, capable of repeatedly releasing and absorbing water, hence likened to "micro-reservoirs" in agriculture. Additionally, they can absorb fertilizers and pesticides and slowly release them, enhancing their efficacy. Highly absorbent resins are widely used in agriculture, forestry, horticulture, construction materials; in industry, they are extensively applied in petrochemicals, cables, papermaking, sensors, fire extinguishing equipment, fiber products, cosmetics, food preservation, and expandable toys.