1, add a big bathtub next to the pool where water needs to be filtered at home;

2. Install water pipes under them to make them communicate with each other;

3. Spread a layer of fine river sand under the pool, then spread bamboo charcoal once, and then spread a layer of fine river sand on the bamboo charcoal;

4. Spread a layer of fine river sand on the bottom of the big bathtub, then spread bamboo charcoal once, and then spread a layer of fine river sand on the bamboo charcoal;

4. Let the water flow into the bathtub through the pool;

5. Settle the water in the bathtub for a while, and the layer of water above the settled water is the filtered water source.