Complete Guide to RO/DI Water Generation Systems for Coral Tanks | How to Choose and Maintain Pure Water Equipment

Why RO/DI Water is Essential for Coral Tanks

In coral farming, water purity is one of the most critical factors determining success or failure. Tap water contains the following impurities:

• Phosphates and Nitrates: Nutrients that cause excessive algae growth
• Heavy Metals (copper, lead, zinc, etc.): Even trace amounts are fatal to corals and invertebrates
• Silica (silicates): Causes brown algae and diatoms
• Chlorine and Chloramine: Damage coral mucus membranes

To remove these impurities almost completely, establishing and maintaining a coral tank requires an RO/DI (Reverse Osmosis + Deionization) pure water generation system.

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How the RO/DI System Works

The RO/DI system removes impurities from tap water through multiple filtration stages.

1. Sediment Filter (Particle Removal)

Removes large particles such as sand, rust, and suspended solids from tap water. Typically uses 5-micron filters and protects downstream filters.

2. Carbon Block Filter (Chlorine and Organic Compound Removal)

Activated carbon adsorbs chlorine, chloramine, and organic compounds. This stage also removes water odor and discoloration.

3. RO Membrane (Reverse Osmosis)

Reverse Osmosis is a purification technology using a semipermeable membrane that allows only water molecules to pass while blocking larger molecules and ions.

• Pressure is applied opposite to normal osmotic pressure, forcing water molecules through the membrane
• Removes 90-98% of impurities (phosphates, nitrates, heavy metals, silica, etc.)
• Water produced at this stage is called "RO water"