Soon, the items were gathered.
In the first layer, Wang Dadong filled it with small pebbles, with a layer of leaves spread underneath.
In the second layer, it was filled with charcoal dust, again with a layer of leaves spread underneath.
...
The third layer was a mixture of charcoal dust and sand, along with a layer of leaves.
The fourth layer was entirely small pebbles and leaves.
A few minutes later, a simple filtration device was completed.
Wang Dadong went to the seaside, holding up the contraption, signaling Guo Ting to add some seawater.
Guo Ting used her hands to scoop a handful of seawater in.
The seawater quickly flowed down through the small pebbles.
"Keep adding," Wang Dadong said.
Guo Ting scooped another small handful of seawater.
After adding three handfuls in total, Wang Dadong said, "That's enough!"
Then began the long wait.
A few minutes later, drop by drop, water began to flow out from the bottom of the contraption.
