Aquarists who live in the city have limited choices of water supply. The most easily available source of water is the tap. However, tap water that will be used to fill an aquarium needs to be filtered. Even though city tap water goes through a purification process to make it safe for drinking, it may still contain chemicals and impurities that are harmful to the living organisms inside a reef aquarium. In areas where only well water is available, or where tap water is not clean, investing in a reverse osmosis filter, or a combination reverse osmosis/deionization water filter, may be needed.
A reef aquarium filtration unit such as a reverse osmosis/deionization unit works to remove almost all of the impurities and contaminants present in water. Using water filtered with this method in the tank not only gives the reef a contaminant-free environment, it can also protect the aquarium from hair algae because the water has reduced phosphate levels.
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