At that time, the sewer system was to discharge dirty water and sewage from the village. Because in ancient times, people paid more attention to gathering wealth, and when laying sewers, they were also tortuous, and they did not go straight outside the house, but they paid attention to feng shui jewelry and the like.
However, because the sewer pipe is crooked, some sludge will not directly flow into the sludge pool where the sludge is stored. At this time, put a turtle, because the turtle prefers this dark and humid place, and it will climb inside with mud, thus acting as a "scavenger" of the sewer.
Tortoise's habit:
Turtles belong to semi-aquatic and semi-terrestrial reptiles. Mainly inhabit rivers, lakes, reservoirs, ponds and other waters. Trapped in water during the day. When it is hot in summer, they look for shade in droves. Gentle temperament, do not fight with each other. When the enemy is injured or frightened, the head, limbs and tail are retracted into the shell.
Turtles are omnivores. They feed on animals and insects, worms, small fish, shrimp, snails, mussels, tender leaves of plants, duckweed, melon skin, wheat grains, rice and weed seeds. Their hunger tolerance is very strong, and they will not die if they don't eat for months.