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Date :2020-12-03
Classify: Activated Carbon

Water filter generally has five levels of filtration, which will purify the contaminated water to meet the requirement for production and life, that is, the main function of water filter can remove solid particles, bacteria, and harmful chemical components in the water.

Working principle of household five-stage water purifier

The first level of PP cotton: removal of all kinds of visible objects/dust and impurities in tap water.
The second and third stages of pre-activated carbon: removal of chlorine and organic impurities. It can also absorb the peculiar smell, color and smell produced by organic compounds in the water.
The fourth level: ultrafiltration or reverse osmosis membrane, the membrane can remove bacteria, viruses and spores in the water.
The fifth level of post activated carbon device: further improve the taste and remove peculiar smell.

CTO compressed activated carbon filter
CTO filter uses coal-based activated carbon or coconut shell activated carbon with high iodine value as the filter material, and is sintered and compressed with the food-grade binder. For this type of activated carbon, the size is small, and require lower ash for better adsorption. The two ends of the carbon core are equipped with soft rubber gaskets to make the carbon core into the filter cartridge with good airtightness.

UDF granular activated carbon filter

For bulk activated carbon filter, the required granular activated carbon particles will be put into a special plastic shell, and the end caps are welded to the two ends of the shell with welding equipment. The two ends of the shell are respectively put into non-woven filter sheets for filtering , to ensure that the carbon core will not drop carbon powder and black water during usage. According to customer needs, the shell end cover can be made into different types of connection ports. Interface methods are: flat pressure type and pipeline type.

How to choose activated carbon for water filter?
According to different water quality, clients can choose coal or coconut granular activated carbon, and some clients will choose impregnated silver activated carbon.
Granular activated carbon Index
A grade water filter B grade water filer
Moisture ≤5% ≤5%
Hardness ≥90% ≥85%
Iodine value ≥1000mg/g ≥800mg/g
Methylene blue ≥135mg/g ≥105mg/g
Phenol adsorption value ≥120mg/g ≥120mg/g
Semi-dechlorinated value ≤6cm ≤8cm
PH 4-11
Density ≤0.5g/cm3
Granular activated carbon Index
A grade B grade
Moisture 10
Hardness 90
Iodine value 1000
PH 4.5-7.5
Methylene blue 135
Ash 5
Impregnated silver value 0.2-0.3 0.06-0.2
Residual chlorine removal rate  


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