Super Absorbent Polymer

Super Absorbent Polymer (SAP) can absorb and retain extremely large amounts of a liquid relative to its mass. These are two types of SAP.
Sodium Polyacrylate:  Use as the absorbent material with no water-releasing functionality.
Potassium Polyacrylate: Use as a water-retaining agent for plants. It works like a sponge absorbent and releases just the right amount of                                        water in response to a plant's root suction.