Water Activated Sandless Sandbags — no sand required. Simply soak in water or drizzle over the bag; it self-expands to about 18–20kg in 3–6 minutes and forms a solid flood-blocking wall with compressive strength ≥150kg. Lightweight and compact before activation, easy to store and deploy instantly. Ideal for doorways, basements, underground passages, flood banks, landslide prevention and urban flood control. Biodegradable and environmentally friendly; service life up to 4 years.
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