Recommended for aquariums of up to 600 litres (158 USgal.) Dimensions: L280 x W157 x H195 mm (L11 x W6.1 x H7.7 in.) Installation depth: approx. 60 to 90 mm (2.3 to 3.5 in.) 230 V / 50 Hz (115 V / 60Hz) 11 W Air capacity: 500 l/h (132 USgal./h)
The skimmers of the Classic DOC skimmer model series operate according to the horizontal rotation principle of the first generation, supplemented with the newly developed air production of the Hydrofoamer. Despite its very small structural shape, this unit has an excellent skimming performance, and is especially suitable for breeding tanks with living plankton. Classic DOC skimmer models can be placed easily and discreetly in the aquarium directly. The immersion depth ranges from 60 to 90 mm (2.3 to 3.5 in.). They can also be used in aquarium cabinets and tolerate water level variations of +/- 20 mm (.78 in.) without readjustment of the air output. Skimmer cup and foam reactor are one unit in all TUNZE® ClassicDOC skimmers. Delivery condition: Completely ready for mounting with holding device for vertical panes and horizontal glass tops up to 19 mm (.74 in.).
In 1963, TUNZE® developed the first series-produced protein skimmer with its own air production. In this rotating Venturi skimmer, the hard water jet of a pressure pump is used to produce a constant fine mixture of air bubbles, which is passed into an easy-to-clean skimmer cup by means of an effective removal system. An integrated contact pipe is used to remove protein particles from the water. The refill from the aquarium then is drawn in automatically by means of the so-called molecular compensation pressures (diffusions). This TUNZE® invention of contact skimming makes sure that no living plankton is drawn into the pump circulation.
Marine aquarium inhabitants produce waste substances, the quantity depends on the livestock and the feeding. By means of an effective skimming system, organic waste matter, the so-called DOCs (Dissolved Organic Carbons), can be removed. To mention but a few, these are substances such as proteins, cellulose, dead cell substances from bacterial and algae. In high concentration they are harmful for any aquarium biotope. The DOC skimmer removes these compounds effectively from the water circuit, better than a bio-mechanical filter, which means that by removing proteins “before” bacterial decomposition, crystal-clear water is retained and a rise in nitrate and phosphate is reduced. It can be observed that when air bubbles are produced proteins are absorbed immediately. In practice it can be observed that the absorbed matter is torn off the air bubbles again by skimmers with a tall reaction chamber. For this reason, all TUNZE® DOC skimmers have very short reactors with a high air throughput .
In the skimmer, the TUNZE® Hydrofoamer produces a large quantity of a mixture of 50 per cent of water and 50 per cent of fine air bubbles. Each air bubble has an active surface which binds the electrically charged DOCs (Dissolved Organic Carbons). The air water mixture is immediately transported into the middle reactor area, producing a dense foamy mass. The upper zone of the reactor is used to settle this foamy mass laden with protein, which is then removed into a special foam cup or into the foam extraction pipe. The purified water returns into the aquarium without bubbles or into the filter. By means of a special nipple, ozone can be introduced into the system, thus improving the skimming process and at the same time removing any yellowing matter in the aquarium water.
These skimmers operate according to the horizontal rotation principle and are driven by the Hydrofoamer. The entire skimmer operates on the basis of the so-called contact skimming method. For this reason, coarser particles in the size of plankton are not drawn in. This method of operation is very gentle so that no living plankton is drawn into the pump circuit. The extremely flat construction makes it the smallest skimmer in its performance class. Low sensitivity In soft coral aquariums with leather corals and anemones, for example, the share in dissolved organic matter may be higher, sometimes it may even be vital. In this type of aquarium, the recommended aquarium volume can be used without deduction. High sensitivity Aquariums with primarily small-polyp stony corals (SPS) require an especially high degree of purity. They should have no load of phosphates or nitrates worth mentioning. The Classic DOC skimmer should NOT be used as a “stand-alone” solution in these aquariums. This type of aquarium should be reduced by about 60 per cent in volume for the skimmer volume mentioned. High sensitivity for breeding tanks with plankton Stone coral aquariums or other breeding tanks with plankton food require an especially high degree of purity. Good oxygen saturation and very clear water are the pre-requisites. This type of aquarium should be reduced by about 70 per cent in volume for the skimmer volume mentioned.
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