1. Density observation: Density is an important indicator for judging the quality of activated carbon. High-quality activated carbon usually has a large volume, because its production process will create as many pore structures as possible to increase its adsorption function. Therefore, under the same weight, the volume of high-quality activated carbon will usually be larger, and it will feel relatively light.

2. Bubble test: Put the activated carbon into water and observe the bubbles it produces. Due to the soaking effect of water, the water will gradually enter the pore structure of the activated carbon and expel the air therein, thus producing tiny bubbles. The more intense the bubbles are and the longer they last, the better the adsorption performance of the activated carbon.

3. Production company: When buying activated carbon, you should choose a company that specialises in the production of activated carbon. These companies usually have stricter quality control and production standards, which can guarantee the quality and reliability of the product.

4. Particle size: According to national standards, the particle size of activated carbon should be between 20-40 mesh, usually around 0.5-1.5mm. The adsorption performance of activated carbon with too large particles will be affected, so we should try to choose products with fine particles.

5. Adsorption value test: The adsorption value of activated carbon is one of the important parameters for evaluating its adsorption performance. Consumers can check the product labels or ask manufacturers for adsorption value data to understand its adsorption capacity.

6. Three-party test: You can take a small amount of samples and send them to a professional laboratory to test the indicators. The number of activated carbon has its own laboratory testing, can be free to test the iodine value, moisture, ash and other indicators.