Sandoponic System
The sandoponic system was originally developed by Sahrawi agricultural engineer Taleb Brahim Khalil as a way to save water in his family garden, Algaada Center. It works a little like hydroponics, but instead of growing plants in water and nutrient solutions, it uses sand.
The idea is surprisingly simple. A raised bed is built from bricks and filled with sand from the valley. The bed is lined with plastic, and at the bottom a small pipe drains any excess water into a collection tank below. Because the sand is so permeable, the water moves through it easily. A pump then sends the water back into the bed, creating a closed-loop system where almost nothing is wasted.
We installed this system in the garden and we were amazed by how well it worked. But for us, that was only the starting point. We immediately began asking questions. Could it be made cheaper? Could it be built with materials that people already have? Could it be healthier for the plants? So we started experimenting.
One of our first trials was a smaller version built from mud bricks and lined with single-use plastic. Instead of using a pump, we used two containers – one above and one below – and let gravity do the work. We also added homemade compost to enrich the sand.
The system worked. It was simple, affordable, and easy to build. But it also revealed its weaknesses. The mud bricks were damaged by rain, and the lower container was too small to support multiple growing beds. So we kept going. To make the system stronger and easier to scale, we built a large raised bed square base using compacted sand inside old tires. Inside this platform, we could safely place four raised beds, separated by whatever materials were available. We also installed a larger tank so that all four beds could share the same water reservoir.
Each version taught us something new.
Today, the system costs less to build and can support more plants. But we don’t see it as a finished invention. In the garden, the first model is only a prototype – a way of proving that an idea can work.After that, the real work begins.
We keep experimenting, making small changes, learning from failures, and trying new ideas. Every season brings another improvement, another question, another possibility.
And we think there is still much more to come.