Submerged plants play a crucial role in the natural filtration of water in BIOpools. They are strong competitors to filamentous algae because they absorb a large amount of nutrients directly from the water, which limits the algae's ability to spread. As they grow from depths of around 60 cm to 2 meters up toward the surface, they also take away light and warmth that algae need to survive.
Examples include Canadian waterweed, which grows entirely underwater, or Crassula recurva, whose flowers can emerge above the surface. In addition to cleaning the water, submerged plants also have a strong oxygenating function. Through photosynthesis, they produce oxygen and consume phosphates—one of the main nutrients for algae. This significantly improves overall water quality and supports a balanced aquatic ecosystem.
Submerged plants should be part of every natural pool. It is recommended to use at least five to eight different species, as each plant plays a different role. Together, they also help form a natural biofilm that further supports water filtration.
The right mix of submerged plants is essential for a healthy, clean, and chemical-free BIOpool.
