The irreplaceable role of filter cotton

Filter cotton Commonly used for physical filtration is white cotton, black cotton, rattan cotton. The white cotton placed in the filter tank needs to reach a specific thickness to complete and improve the retention capacity. If the thickness of the white cotton is insufficient or the water flow is too strong, the waste will directly pass through the physical filtration zone, resulting in physical retention failure.

Reduce the intensity of the water flow. Only by reducing the intensity of the flowing water can the physical retention capacity be enhanced and the effective utilization rate of white cotton increased. In popular terms, the opening density of the rain pipe is increased, so that the flowing water is evenly dispersed and the intensity of the flowing water is reduced. Residues and fish excreta will not enter the biological filtration zone through the white cotton under the action of water flow. Or put a stocking at the sewage outlet to block impurities such as food residues in the stockings, and then clean the stockings at the later stage, which can also reduce the intensity of the sewage.

Adopt dry and wet separation filtering form: If all white cotton is soaked in water, it will weaken the physical retention, and the contaminated white cotton and waste will quickly pollute the entire water body. At the same time, the white cotton will be replaced regularly, and the contaminated Replace as soon as possible to reduce water pollution as much as possible. In general, the 16-character policy for white cotton replacement is based on the principle of "do not change when you change the top, do not change when you change the top, do not change the water when you change the cotton, and do not change the cotton when you change the water."

Drip filtration is also used, which can fully aerate and increase dissolved oxygen, make carbon dioxide easily escape, prolong the acidification period of water quality, and is more suitable for breeding large-scale landscape fish. However, this will not be very beautiful. The drip rack is set up behind the fish tank. Without sufficient height, it is difficult to fully utilize the advantages of drip filtration. It depends on how you think about this problem.