The filter (10) comprises an activated carbon layer (11) and a filter paper layer (12) located outside the activated carbon layer (11).

Another method has been to place a layer of coke in the pot, lowering the anode down to the coke and let the main current pass the layer of coke which is thereby heated.

The activated carbon layer (22) is configured from activated carbon and a binder (A) for adhering the fin (20) and the activated carbon to one another.

Activated carbon is filled in the activated carbon layer (11), and a photocatalyst is coated on the surface of an activated carbon.

The activated carbon layer is arranged upstream of the layer of the oxide mixture in the direction of flow, wherein the activated carbon has a water content of < 3% by weight.

The activated carbon adsorption device mainly comprises an activated carbon layer and a support layer.

The activated carbon adsorption device mainly comprises an activated carbon layer and a support layer.

Said element is an ordinary resistive element, preferably a coal layered resistance, a thin layered resistance or a thick layered resistance.

The activated carbon layer (11) faces the light source (20).

The activated carbon adsorption device mainly comprises an activated carbon layer and a support layer.

Some pumping drainage holes (6) are located in the coal bed (5).

The raw water is purified by being caused to pass through the first activated carbon layer (88), the hollow fiber membrane filter (130), and the second activated carbon layer (132) in that order.

Try to make the sand layer about as thick as the charcoal layer.

The length of the pipe string is greater than the depth of occurrence of the lower coal bed.

Add a thin layer of the activated charcoal, and then add a layer of sphagnum moss