1. UV lamps are mainly for the DNA to generate destructive effect, so the UV lamp using absolute to avoid direct irradiation of any fish or aquatic plants.
2. UV lights use: must be sealed container, and the lower the better flow intensity.
3. Use for sterilization: bacteria, mold, virus, lice, fleas, algae, fungi, algae, zooplankton spores and white nematode ..... And so on, use the length of time depends on your use of objects, and of course water slower the better, is generally 2 days can be effective, but in general the spore class needed it takes a long time.
4. UV lights is good for both freshwater and saltwater. It provide permanent control of suspended algae which cause green water. It removes heavy algae blooms (usually within 5 days) and keeps the pond algae free，that means there’s no more green water while reducing pond maintenance，meanwhile，prevents waterborne pathogens and reducing unpleasant odors.
There are many sites in the UK that sell fish pumps but i prefer to shop where there is good aftercare. Fishpark responds very quick and solves issues, if any, very fast. I really appreciate good aftercare from a purchase. As for the UV light its quite lengthy but it works really well.
Was happy with item