Aquario as a store with many water purification products, also offers filter cartridges that aim to lower, or even completely remove P04 from the aquarium. The exception is aquariums with a lot of plants and few fish, where it is advisable to maintain a higher concentration of phosphates. If we are looking for more universal products, we also have agents that simultaneously allow the removal of harmful nitrates (NO3) and nitrites (NO2) from the water. Lowering P04 is one of the tasks that must be completed to enjoy clear, healthy water and to be able to boast about a well-maintained aquarium. Many products, thanks to increased porosity and filtration surface, allow for maintaining low P04 concentrations for a long period, effectively protecting the water from the formation of harmful algae, including red algae.