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1. How to make a septic tank is the simplest. A septic tank is a device that processes feces and filters and settles them. In rural areas, septic tanks usually adopt a three grid structure with a "eye" shape, and the three tanks are connected by manure pipes. Their respective functions are as follows: the first compartment is used for intercepting sediment and preliminary fermentation, the second compartment is used for secondary fermentation, and the third compartment is used for storing feces that have been basically harmless. When choosing the location of the septic tank, it should be ensured that it is far away from the main house to avoid odor issues. Prepare the necessary tools and materials for construction, such as bricks, cement, brick knives, ash boards, manure pipes, etc. After preparation, sprinkle lime lines at the determined positions, mark the size and shape of the septic tank, and then excavate a pit with a depth of about 1.2 meters. After excavating the soil pit, lay 5cm thick crushed stone as the bottom plate, and then pour a layer of 8cm thick 150 grade concrete. After the bottom plate is completed, brick the walls of the septic tank and pay attention to burying the manure pipes. When the wall is built to a certain height, apply cement and continue construction. When installing the manure pipe, the position should be at 1/3 of the effective depth, and ensure that the manure pipe from the first pool to the third pool has a downhill trend. After the wall is built, first use a 1:3 cement mortar as a base, and then use a 1:2 cement mortar for plastering, with a thickness of 1cm. After that, install the septic tank cover, usually using a 5cm thick reinforced concrete cover plate. After the cover plate is installed, the ground should be treated to make the septic tank 3 to 5cm above the ground to prevent rainwater from flowing in. The working principle of a septic tank is that fresh feces enter the first tank through the inlet and begin to ferment and decompose inside the tank. Due to different densities, the fecal liquid is naturally divided into three layers: the upper layer is a paste like fecal skin, the lower layer is a block or granular fecal residue, and the middle layer is a relatively clear fecal liquid. The upper and lower layers contain more bacteria and parasite eggs, while the middle layer has fewer. The initially fermented middle layer manure overflows through the manure pipe to the second tank, while most of the unfermented manure skin and residue remain in the first tank for further fermentation. The fecal liquid flowing into the second pool further ferments and decomposes, the insect eggs continue to sink, the pathogens gradually die, the fecal liquid is further harmless, and the thickness of the produced fecal skin and residue is significantly reduced. The feces flowing into the third pool are usually already decomposed, and the bacteria and parasite eggs have been basically killed. The third pool mainly serves to store the basically harmless manure. The structure of a septic tank mainly consists of a toilet, an inlet pipe, a discharge pipe, a three-stage septic tank, and a cover plate. Toilets can be straight through and connected to the fecal inlet pipe, or water sealed toilets can be used without the need for a separate fecal inlet pipe. It is recommended to use plastic pipes with a diameter between 10-15cm for passing feces. The third level pool can be constructed with brick and cement powder walls

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