21×62″ coconut shell activated carbon equipment


Equipment with automatic control of coconut shell activated carbon

Carbotecnia’s Micro 4 coconut shell activated carbon equipment is an essential step in the water purification process. They are ideal for dechlorination and reduction of low molecular weight compounds.

Being of vegetable origin and thermally activated, Micro 4 has a low concentration of soluble matter compared to mineral coals.

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Automatic and manual activated carbon filter 21×62

The 21×65 activated carbon filter is designed and calculated with activated carbon with a size range of 12 x 40 U.S. Std. Mesh, which are smaller than the 8 x 30 U.S. Std. size. Mesh thus helping to increase the rate of diffusion, consequently, the rate of dechlorination and adsorption of organic contaminants becomes faster. This means that with a smaller bed volume we can achieve the same performance of a larger bed volume of a coal with a larger particle size.

Available configurations:

Simple automatic equipment by time: Carbotecnia single tank equipment with dual loading, with manual or automatic control valve for backwashing by time (every a certain number of days or on a certain day of the week). Recommended for domestic or commercial use, and operation less than 23 h.

Multiple automatic equipment: This configuration can only be found available for premium valves with industrial control (Clack WS2H and WS3). Up to 16 units are allowed to operate.

  1. Parallel equipment: this option allows all filtration units to operate at the same time, unless a filter in the system is in backwashing stage. This system is programmed in such a way that when one of the equipment requires backwashing, either due to time or pressure drop, the backwashing sequence is initiated in series for all the equipment in the system, starting with the one that sent the signal.
  2. Progressive flow equipment: this option is ideal when water demand varies and we have peak operating flows at different times of the day. This function consists of setting a flow value at which one or more pieces of equipment will come into operation in order to meet the required flow. A flow value must be specified for the incorporation of each of the equipment in the system.

Automatic activated carbon filters with premium valves (digital clack):


Code Type Tank size (in) Bed volume(ft3) Cross-sectional area (ft2) Service flow to dechlorinate (lpm) Service flow to dechlorinate (gpm) Service flow for potabilization (lpm) Service flow for drinking water treatment (gpm) Backwash flow (lpm) Backwash flow (gpm) Automatic digital/manual valve Input/Output Connections Connections Drainage
P_630018 Automatic 21×62 6.5 2.41 76 20 64.3 17 145.72 38.5 Clack WS1.5
1 ½”
1 ½”
P_630009 Manual 21×62 6.5 2.41 76 20 64.3 17 145.72 38.5 Purago F2 2″ 2″

Components of a filter:

Fiberglass tank: Manufactured in one piece with fiberglass-lined polypropylene interior for mechanical and weather resistance. No need for external maintenance. Maximum operating pressure 150 psi.

Valve or automatic control head: It is the component that makes the raw or untreated water pass through the activated carbon bed, it includes inlet, outlet and drain connections; it allows us to change between the different service or backwashing positions, automatically programmed by time. Maximum operating pressure 125 psi.

Manual control valve: It is the component in which the inlet, outlet and drain connections are made; it allows us to change between the different service or backwash positions manually. Maximum operating pressure 125 psi.

Granular medium:Coconut shell activated carbon Micro 4 mesh 12 x 40 with a minimum B.E.T. surface area of 600m2/g.

Lower distributor and distribution tube: The lower distributor or baskets are a micro-grooved element that allows for proper flow distribution in the backwash position, and operates as a physical barrier that does not allow leakage of granular media to the outlet line, in the service position. There are simple, stack type distributors or distributors with lateral tubes, spider type; their selection depends on the service and backwash flow, as well as the diameter of the tank. Its material of construction is HDPE or ABS. The central pipe is a PVC Ced pipe. 40 connecting the lower distributor to the control head or valve.

Backing gravel: 1/8 x 1/16 U.S. Std. silica backing gravel, 1/8 x 1/16 U.S. Std. Mesh. By having a micro-grooved distributor, the need to place several gravel beds of different grain size is eliminated.

Operating conditions:

  • Bed height (in): 24 – 36
  • Clearance height for bed expansion (%, min.): 50
  • Hydraulic service load to dechlorinate (gpm/ft2): 3 – 10
  • Hydraulic service load for water treatment (gpm/ft2): 1 – 6
  • Hydraulic backwash load (gpm/ft2): 14 – 16
  • Operating pressure: 30 – 100 psi
  • Backwash: by pressure differential >10 psid. or by time every 72 hours max.
  • Lifetime of granular media: 1 to 2 years
  • Prefiltration: 5 microns

Activated carbon we use

By nature, activated carbon Micro 4 has a microporous surface over its entire surface, these pores are able to more efficiently adsorb organic contaminants that have a low molecular weight, cause tastes and odors in the water, or are harmful for consumption, such as pesticides, disinfection by-products, hydrocarbons, etc. Likewise, its high hardness compared to activated carbons of other raw materials makes it a material more resistant to erosion, which in turn helps to avoid loss of material during operation. This property makes it an ideal element for use as pretreatment in softening, demineralizing or reverse osmosis equipment; in these processes, the presence of suspended solids, such as carbon particles, is practically undesirable.

Advantages Applications
  • High efficiency in eliminating chlorine.
  • Granulometry with good screening process to avoid pressure drops or clogging.
  • Low fines content for shorter start-up time.
  • It uses automatic valves for better control of maintenance and backwashing.
  • Industrial process water treatment.
  • Water purification.
  • Reverse osmosis pretreatment.


More information:

Frequency of change of the activated carbon of a unit

Importance of backwashes and how and when to perform them?

Sanitization of activated carbon beds


Activated carbon filters for water, how do they work?

Additional information


Automatic Valve, Manual Valve