Inside the bag were several pieces of black, honeycomb-like stone. Lin Dahe paused for a moment before realizing they were burnt beast bones. The system excitedly marked them as: [High-Quality Activated Carbon Material].
The One-Armed Veteran tapped the newly dug water reservoir with the handle of his knife and asked, "What do we do now?"
"Let's split up," Lin Dahe assigned tasks. "Uncle Li, take some people to dig the sedimentation tank. Brother Zhao, go collect ash from the plants. Xiaoman..."
He glanced at the injuries on the girl's face and suddenly fell silent. Cui Xiaoman had already picked up a shovel, saying, "I'll keep an eye on the Zhou family to prevent them from making any more moves."
The system's countdown flickered in the dawn light: [58:22:17]. Lin Dahe looked at the lightening skyline and for the first time felt that the red numbers weren't so glaring.
Moonlight filtered through the window, casting mottled shadows on the muddy ground. Lin Dahe ground the last piece of burnt beast bone into fine powder, the sound of stone mortar and pestle clashing echoing clearly in the quiet night. Cui Xiaoman squatted by the stove, using an embroidery needle to drill a third row of tiny holes in a bamboo tube, glancing up at Lin Dahe's direction with each hole she made.
"Make them closer together," Lin Dahe said without looking up, his fingers pinching the bone powder to check its fineness. "The smaller the holes, the better the filtration."
Cui Xiaoman pouted, her needle brushing against her hair bun. "Do you think I'm some skilled artisan from an embroidery workshop?" Despite her words, she leaned closer to the oil lamp and halved the distance between the holes again.
Various materials were scattered on the ground: coarse burlap, fine river sand, dried calamus roots, and alum borrowed from Seventh Uncle's house. Following the proportions provided by the system, Lin Dahe layered the bone powder and fine sand into the bamboo tube. His movements were slow; each layer had to be gently compacted with a wooden stick to ensure there were no gaps.
"Can this thing really filter water?" Cui Xiaoman poked at the bamboo tube filled with black powder with her chopsticks. "It looks dirtier than Aunt Ma's foot bath."
Lin Dahe didn't respond; instead, he scooped a spoonful of wastewater collected downstream from the Zhou family. The surface was covered in strange foam and emitted a foul odor of decaying grease. As he slowly poured the wastewater into the bamboo tube, both of them instinctively held their breath.
When the first drop of water seeped out from the bottom of the tube, Cui Xiaoman's eyes widened in surprise. "It's... clear?"
Drops of water fell one after another, gathering into a transparent liquid in a ceramic bowl. Lin Dahe carefully shook the bowl; tiny ripples danced on its surface, reflecting the light of the oil lamp, pure as mountain spring water.
"Try it." He handed the bowl to Cui Xiaoman.
The girl hesitated for a moment before taking a small sip; her eyes instantly brightened. "It's sweet! And there's a bit... of herbal fragrance?"
The system interface flashed: [Simple Filter Completed, Purification Efficiency 68%]. Lin Dahe let out a long breath and realized his shirt was already soaked with sweat.
"To supply the whole village, we need at least twenty of these filters." He counted what little materials remained and frowned again. "We don't have enough bone charcoal..."
Just as Cui Xiaoman was about to speak, the wooden door was suddenly pushed open. The One-Armed Veteran walked in carrying a burlap sack covered in kiln ash. "This is from Dumb."
When he opened the bag, it revealed half a basket of charcoal residue left over from firing pottery, mixed with unburnt willow branches.
"He said..." Old Soldier made a stirring gesture with his hands. "If we reforge it once more, its effectiveness can rival that of bone charcoal."
Lin Dahe picked up a piece of charcoal residue for a closer look; its cross-section displayed an even honeycomb structure. The system immediately popped up a prompt: [Willow Charcoal Porosity Meets Standards, Can Replace Bone Charcoal].
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