RO Unit Basics
by Leah Watkins
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Why Use RO Water?
One of the questions we are often approached with is “What are the advantages to RO water?” In order to understand the advantages of RO water, it is important to understand what RO water is. RO, or Reverse Osmosis units remove impurities from the water as it passes through each chamber of the unit. So, why use RO water? The answer is simple! Reverse osmosis water is free of nitrates, phosphate, silicates, and other impurities. What this means for the aquarist is that the nutrients that contribute to algae growth, (often found in |
tap water) are nonexistent. Other benefits include removing heavy metals and chlorine, but the number one reason aquarists use RO is for the prevention of excess algae.
RO Filtration Stages
First, there is the sediment filter. Its job is to remove sediment and dirt from the water. This stage prevents the next stage, the carbon block, from becoming clogged quickly. The unit we stock (AL8292) is 1 micron, and its average replacement time is every 6-12 months*. Second, there is the carbon filter. It is responsible for removing chlorine and heavy metals. This filter (AL8293) is 2 micron, and will last for approximately 6-12 months*. The next stage, and in many cases, the final stage is the membrane. This filter (AL8303,AL8304) is doing the majority of the work and removing the most pollutants. Many aquarists will get 1-2 years* out of their membrane when they keep their sediment and carbon cartridges changed. You can test your membrane by measuring total dissolved solids, or TDS. If the level is significantly above 0, it’s time for a new membrane. Some units come with a DI cartridge (AL8305.) DI cartridges offer a final stage of polishing. The average replacement time varies greatly, at 3 weeks-12 months*. Replace when TDS level reads above 0.
All replacement times are estimates. They are dependent on how clean/dirty your source water is, how much water you use, etc.
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