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RODI Water Filter

The primary purpose of RODI water filters is to purify tap or well water by removing impurities that can be detrimental to delicate saltwater organisms. This entry explains the filtration process and mechanical compontents of our filters.
An RODI (Reverse Osmosis Deionization) water filter is an advanced type of water purification system that combines two processes to produce ultra-pure, contaminant-free water.
This filtration process involves two main components: reverse osmosis and deionization.
Reverse osmosis, the first step in this filtration process, utilizes a semi-permeable membrane to separate dissolved solids from the water. Applying pressure on one side of the membrane effectively allows pure water molecules to pass through while blocking larger particles and contaminants. As a result, harmful substances like chlorine, heavy metals, nitrates, phosphates, and other pollutants are effectively removed from the water.
Deionization removes any remaining impurities that may have passed through during reverse osmosis. This stage employs specialized resins that attract ions in the water through an ion exchange process. The resins act like magnets for positive or negative ions in minerals or salts dissolved in tap water. By attracting these ions onto their surfaces and replacing them with hydrogen or hydroxide ions, respectively, deionization ensures further purification.
The combined effect of reverse osmosis and deionization provides aquarium owners suitable water for their tanks.

Features

RODI water filters purify tap water by removing impurities through reverse osmosis, followed by deionization. Here are some of the common features of an RODI filter:
Multiple Stage Filtration:
Most RODI systems are designed with multiple stages of filtration, typically four to six. Each stage is designed to remove different types of contaminants.
Reverse Osmosis Membrane:
The reverse osmosis membrane is a critical component of any RODI system. It's semipermeable, allowing water to pass through while filtering out a significant portion of the contaminants.
Deionization Resin:
The deionization stage uses a special resin to remove ions from the water that weren't filtered out by the reverse osmosis membrane, ensuring an even higher level of purity.
Pre-Filters:
The pre-filters in an RODI system often include a sediment filter and a carbon filter. The sediment filter removes larger particles, while the carbon filter removes chlorine and other chemicals.
Automatic Shut-Off Valve:
Many RODI units incorporate an automatic shut-off valve, which turns off the system when the storage tank is full. This prevents water waste and potential damage to the system.
Flow Restrictor:
The flow restrictor controls the water flow rate, ensuring the water spends enough time in contact with the RO membrane for effective filtration.
Pressure Gauge:
A pressure gauge is often included to monitor the water pressure entering the system. Adequate pressure is vital for the efficient operation of an RODI system.
TDS Meter:
Some RODI systems include a TDS (Total Dissolved Solids) meter. This measures the amount of dissolved solids in the water before and after filtration, clearly indicating the system’s effectiveness.
Filter Specifications
1
2
3
4
5
Column 1
Column 2
Column 3
Dimensions
Units
Additional Components
Height
15 inches
Three intake/output hoses
Width
14 inches
Wiring
Depth
6.5 inches
Display Guage
Weight
5.5 inches
Mounting Unit and Hardware
There are no rows in this table
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Photograph of the AquaticLife RODI filter model with annotations for dimensions. Photo from Hayley Blackburn, 2024
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