Wide Range of Applications: Hydroponic sponge blocks are suitable for various soilless cultivation, hydroponic systems, aeroponics, etc. Hydroponic sponge blocks are Perfect for indoor growing, making research, observation and recording easy. Premium Water Absorbency: Soak the sponge pieces in water in advance before use to they absorb water completely. Check the condition of your hydroponic sponge regularly. Make adjustments promptly. It saves time and effort to use and is simple to operate. Package Includes: You get 12 sheets whole hydroponic sponges - 1200 pcs mini planting sponges. You can choose to use these hydroponic planting sponge separately. The size of the separated small hydroponic sponge pieces is 1inch. Seed : Hydroponic sponge Squares provide the Perfect environment for seed germination. Our sponge blocks are pre-drilled for easy insertion of your plants. Sponge blocks have good water retention and ventilation, promoting the growth of healthy seedlings. Note: Avoid soaking sponge pieces in water for long periods of time as this can cause a lack of oxygen to the plant ., Manufacturer: CTRLZS