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Why Use RO Water in Aquariums?

RO Water for fish tanks
RO Water

What is RO Water?

Reverse Osmosis (RO) water is water that has been purified through a process that removes most impurities and dissolved minerals. This process involves pushing water through a semi-permeable membrane, which filters out contaminants, leaving you with highly purified water.

Why Use RO Water in Aquariums?

  1. Purity: RO water is almost free from chemicals, heavy metals, and other impurities. This purity makes it ideal for sensitive aquatic species.

  2. Control: It allows hobbyists to have complete control over the water parameters by adding minerals and other elements as needed.

  3. Consistency: Using RO water ensures that the water quality remains consistent, which is crucial for the health of tropical fish and shrimp.

Benefits for Tropical Aquariums

Stability and Health

  • Reduced Contaminants: Tropical fish are sensitive to contaminants like chlorine, chloramine, and heavy metals, which are often present in tap water. RO water eliminates these harmful substances, reducing stress and disease.

  • Customisable Water Parameters: Different tropical fish require specific water conditions. RO water, being pure, can be easily adjusted to meet the precise needs of your fish by adding buffers and minerals.

Algae Control

  • Fewer Nutrients for Algae: RO water lacks the nutrients that algae need to thrive, which helps in keeping algae growth under control, ensuring a cleaner and healthier tank environment.

Benefits for Shrimp Tanks

Optimal Breeding Conditions

  • Perfect for Delicate Species: Many shrimp species, such as Crystal Red Shrimp, require very soft, low-mineral water to thrive and breed successfully. RO water provides the perfect base.

  • pH Stability: Maintaining a stable pH is crucial for shrimp health. RO water, when re-mineralised correctly, offers the stability that shrimp need.

Reduces Mortality Rates

  • Consistency in Water Quality: Shrimp are highly sensitive to changes in water quality. Using RO water ensures that the parameters remain consistent, reducing the risk of shock and death.

How to Use RO Water in Your Aquarium
  1. Re-mineralisation: RO water needs to be re-mineralised before use, as pure RO water lacks essential minerals that fish and shrimp need. Use a trusted re-mineralizer to add back the necessary elements.

  2. Regular Testing: Regularly test the water parameters such as pH, GH (General Hardness), and KH (Carbonate Hardness) to ensure the water remains optimal for your aquatic inhabitants.

  3. Gradual Changes: When switching to RO water, do it gradually. Sudden changes in water chemistry can stress or even harm your fish and shrimp.

Frequently Asked Questions

1. Can I use RO water directly from the system?

No, RO water must be re-mineralised before use in aquariums as it lacks essential minerals.

2. How often should I change the RO water?

Regular water changes are essential. Typically, 10-20% weekly water changes are recommended, but this may vary based on your tank's needs.

3. What should I add to re-mineralise RO water?

Use a high-quality re-mineralising product designed for aquariums, which adds essential minerals like calcium, magnesium, and other trace elements.


Using RO water in tropical aquariums and shrimp tanks offers numerous benefits, from providing a pure and stable environment to allowing precise control over water parameters. By re-mineralising and regularly testing your water, you can create an optimal habitat for your aquatic pets, ensuring their health and longevity. Embrace the benefits of RO water and watch your tropical fish and shrimp thrive like never before!

Buy RO Water

If you do not want to go to the trouble of setting up and running your own RO system. Then you can purchase RO Water from various aquatic shops, including from us. For more details on cost and availability pop over to this page!



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