Reverse Osmosis & Deionized Filters For Aquariums

　　In the quest for maintaining pristine water conditions within aquariums, filtration systems are a cornerstone for both hobbyists and professionals. Can you shed light on the roles and effectiveness of Reverse Osmosis and Deionized Filters in the realm of aquarium water purification?

　　Many aquarists are aware of the risks associated with using tap water, which often harbors contaminants like fluoride, chlorine, chloramines, nitrates, phosphates, and heavy metals. The introduction of fertilizers into water supplies, particularly through rainfall, exacerbates these issues, introducing phosphates and nitrates that can stimulate harmful algae growth and pose severe threats to marine life. How do Reverse Osmosis and Deionized Filters address these challenges?

　　Could you elaborate on how Reverse Osmosis systems work to purify water, removing up to 99% of contaminants and providing an optimal environment for fish to thrive? Additionally, what is the role of Deionized Filters in the context of RO filtration, and how do they ensure the removal of virtually all charged contaminants, including heavy metals?

　　Lastly, how does the use of RO and DI filtered water act as a foundation for creating a customized and safe aquatic environment, and what steps should aquarists take to make this water suitable for their specific fish species?