1, different sizes: sea baby is a kind of small beads, which will expand when put in water. Soak mung bean-sized hydroponic beads in water for 5 hours, and they will swell to the size of marbles. Hydroponic beads, small colored beads several millimeters in size, can quickly become large beads with a diameter exceeding 1 cm after being soaked in water.

2. Different solubility: Haibao is easily soluble in water and can only inject one third of the water. Hydroponic beads are slightly soluble in water, and their low concentration aqueous solution is very unstable and easily soluble in general solvents.