Why do pools for aquatic mammals and birds need stronger filtration than fish tanks?

Pools housing aquatic mammals and birds require more robust filtration systems compared to standard fish tanks primarily because these animals produce significantly larger quantities of fecal waste.1

While fish and invertebrates are highly sensitive to water quality, air-breathing mammals and birds are generally more resilient to chemical changes in their environment. Consequently, operators can utilize stronger chemical treatments, such as chlorination, to manage bacteria and maintain water clarity—treatments that would otherwise be lethal to fish.1

Additionally, while whales and dolphins can be maintained in simplified seawater solutions, keeping seals and sea lions in freshwater can sometimes lead to eye irritation due to osmotic effects on their tissues, further highlighting the specialized maintenance needs for these species.1