Why a UV lamp on an aquarium
A UV-C lamp is used to obtain clear water. In addition, some harmful bacteria are killed, which is a nice side effect.
A UV-C lamp is standard on almost all ponds. Some filters even have a UV lamp built in as standard. Nevertheless, the use of UV-C in an aquarium is not obvious. Why then place a UV lamp at a pond and not at an aquarium. After all, they are both systems with fish, water, plants and corals. The answer lies in the plants. Plants consume a lot of nutrients that are also the food for algae. If there are many nutrients present and the conditions (temperature and light) are ideal, floating algae will quickly multiply and the water will turn green. There are rarely enough plants in the pond to create a good healthy environment. In addition, too many and too large fish are used in a pond. A UV lamp at the pond therefore burns constantly.
This is often different with an aquarium.
Plants are often abundantly present and the nutrients are degraded sufficiently by the plants in a healthy system to prevent the floating algae. However, it can also be useful to use a UV-C lamp in an aquarium. As soon as the biological balance in the aquarium disrupts somewhat, floating algae can quickly increase. By regularly switching on the UV lamp, the growth of algae in the aquarium can be prevented.
UV lamp against algae in an aquarium
A UV lamp works against floating algae that occur in the water but does not kill it. The UV-C light is absorbed by the single-celled algae and bacteria. This damages the DNA and the RNA, which means that the algae can no longer reproduce. The dead algae are then collected or skimmed in the filter. This has a very positive influence on the clarity of the water. The water therefore becomes a lot clearer.
UV lamp against diseases (eg ich) in an aquarium
The use of UV-C therefore also works against many harmful but also harmless bacteria. This has both advantages and disadvantages. Healthy bacteria will also die, but since they are mostly attached to the filter and to plants, rocks, etc., the side effect is nil. Harmful pathogenic bacteria that occur in the water are therefore also treated and will be reduced as a result. This reduces the risk of infection from infections via the water.
Power and flow UV-C on an aquarium
There are many types of UV lamps available for an aquarium. It is important that the organisms are irradiated long enough to destroy the DNA. The water must not flow through it too quickly. Also the strength of the lamp is an important factor. The stronger the lamp, the faster the cells are destroyed. You can state that when the flow is doubled, the wattage must also be doubled. It is best to connect a UV-C lamp via a separate small pump.
Note that a UV lamp only emits a limited number of hours of UV-C radiation. This is usually around 8,000 hours. After this time the lamp will still emit light, but will no longer emit UV-C radiation. The amount of UV-C radiation emitted decreases the longer it burns. After 4000 hours, the strength of the UV radiation has already been reduced by 50% (depending on the quality). You therefore need to replace a UV lamp regularly.