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Another method to determine whether activated carbon is still effective is to take a certain amount of new activated carbon and conduct an adsorption experiment using colored water. For example, use a mineral water bottle; take the activated carbon from the bottle’s cap (the amount of activated carbon can be determined by oneself), add clean water to the bottle (the amount can be decided by oneself, but not too much), then pour the activated carbon into the bottle. Add a few drops of yellow dye or methyl blue, etc. (the amount can be determined by oneself, but not too much). After shaking or letting it stand for a certain period of time, remove the solution from the bottle (make sure there is no activated carbon left); this is Solution A. Repeat the above steps again, but this time without adding activated carbon and only with the chemicals, to obtain solution B that has not been treated with activated carbon. Finally, the used activated carbon can be used for experimental comparison; by determining whether the color of the water in the bottle falls between that of Solution A or Solution B, it is possible to assess whether the activated carbon is still effective. It is important to keep the amount of activated carbon added, the amount of water, the amount of medication, and the shaking time constant. Additional notes: 1. The pores of activated carbon can be generally classified into large, medium, and small pores; each piece of activated carbon contains all three types of pores. Which type constitutes the largest proportion depends on the raw material used and the manufacturing conditions. 2. Coconut shell activated carbon is recommended because it has a high adsorption capacity; its specific density is usually below 0.45 g/ml, and its ash content is generally below 5%. The lower the specific density and ash content of the activated carbon, the fewer inorganic salts and impurities it contains, which means that the proportion of pores is higher, thereby enhancing its adsorption capacity. In contrast, coal-based activated carbon has relatively higher specific density and ash content, though this is not always the case if it has been specially treated in advance. The activated carbon used for solvent absorption that I’ve come across is mostly made from coconut shells; that’s why I recommend using coconut-shell activated carbon. In fact, it’s also fine to use coal-based activated carbon, as it’s cheaper as well, provided it isn’t carbon that has been recycled from factories, since who knows what residues might still be present in it. 3. In the production process of activated carbon, temperature control in the activation furnace is extremely important, as the temperature level determines the adsorption capacity and degradation rate of the activated carbon. Higher temperatures make it easier for the activated carbon to turn into ash, but they also enable more effective removal of the substances that have been adsorbed. Air filters: Primary air filters, medium-efficiency non-woven bag filters, high-efficiency filters without partitions, high-capacity medium-efficiency filters, bag-type activated carbon filters, honeycomb activated carbon filters, activated carbon filter cabinets, medium-efficiency filters, high-efficiency air filters, primary filters that can be cleaned, high-temperature resistant primary filters.