5.
This is the pool water filtration equipment room. Clean seawater from the museum’s reservoirs flows into the rehabilitation pools. After some time, the used water passes through these pipes into an automatic drum filter which removes fine particles. The self-cleaning filter rinses waste into the wastewater system.
The purified water then returns to reservoirs behind this wall. Pumps send it to the protein skimmer, where organic matter and sea foam are removed. Ozone from an ozonator helps break down impurities, and the decantation chamber neutralises any remaining ozone.
Finally, the water passes through sand filters, where harmful ammonia is converted into harmless nitrates. It then flows through an ultraviolet lamp which destroys pathogens and bacteria before the clean water returns to the outdoor pools.
All of this is done to maintain safe conditions for keeping animals at the Baltic Sea Animal Rehabilitation Centre.