Filtration can be divided into overflow and trickle. If it is really in the hospital, it is best not to set the drip, because it will be very noisy and affect the rest. Overflow filtration is the foundation. Overflow filtration can be divided into four parts: sedimentation, physics, biochemistry and clear water. If it's an underground pool, there must be a sewage bin. The drain pipe at the bottom of the main tank is connected with the filtration and sedimentation bin, then passes through the water baffle to the physical filtration and biochemical filtration parts, and finally reaches the clear water bin, and the water pump is pumped back to the main tank. Set the surface water pipe, 90-degree pipe is connected to the sedimentation tank, and the surface water of the main tank is introduced into the sedimentation tank.
Physical filtration is suitable for placing cotton, brush and other filter materials, and biochemical filtration part can be placed with biochemical balls, bacteria room, biochemical cotton and so on. Finally, filters such as oyster shells can be installed less near the clear water warehouse to adjust the water quality. Do not use activated carbon when filtering.
The sequence of pond construction: digging-pipe filling-cushion-reinforced concrete-four pond walls-filter partition.
It should be noted that the pipe is good and must be the national standard pvc water supply pipe.