5 Best Reverse Osmosis (RO/DI) System for Aquariums (2024)

Lauren Kiekbusch
best ro di system for aquarium

Reverse Osmosis filters are extremely effective and make excellent aquarium filters, though the water will need to be remineralized before being added to the tank.

This system produces high-purity water that is free of water hardness, chemicals such as chlorine, and toxins, as well as removes up to 99 percent of dissolved solids in the water. This creates a neutral environment in which you can cultivate the ideal conditions for your fish to thrive.

In this article, we will show you how to choose the best reverse osmosis (RO/DI) system for your aquarium.

So, let’s start with the question: What should be considered before buying a reverse osmosis system?

Because systems come in various sizes designed to work with various aquarium sizes, make sure to carefully examine the system’s capacity before making your purchase.

To ensure that the purifier can remove up to 99 percent of system contamination, use a total dissolved solids (TDS) meter to compare the filtered water to the source water.

A reverse osmosis system requires high water pressure to function properly, and reverse osmosis tanks should have pressures of 7 to 8 psi without any water in the tank.

Now, my friend, we are just getting started. 

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5 Best Reverse Osmosis (RO/DI) System for Aquariums (2021)

Finding the right reverse osmosis system for an aquarium can be difficult because there are so many options available. But we have listed the top best products that are available on the market. So go through the list, and you’ll find the information in detail in this article very useful.

Product nameSpecificationAvailable
Max Water 6 Stage Aquarium Reverse Osmosis System
  • Package Dimensions ‏ : ‎ 18 x 17 x 16 inches
  • Item weight : 29 Pounds
  • Date First Available ‏ : ‎ June 2, 2019
  • Manufacturer ‏ : ‎ Max Water
Max Water 5 Stage Home Reverse Osmosis System
  • Package Dimensions ‏ : ‎ 17 x 17 x 15 inches
  • Item weight : 27 Pounds
  • Date First Available ‏ : ‎ April 12, 2018
  • Manufacturer ‏ : ‎ Max Water
3 Stage lime Anti Scale Inhibiting 10" Clear Whole House Water Filtration System
  • Product Dimensions ‏ : ‎ 15 x 6 x 15 inches
  • Item weight : 17 Pounds
  • Date First Available ‏ : ‎ June 1, 2021
  • Manufacturer ‏ : ‎ Max Water
Max Water 3 Stages 10"x 2.5" 3/4" Port Whole House Iron Manganese Water Filter
  • Item Weight :‎17 pounds
  • Manufacturer : ‎Max Water
  • Product Dimensions : ‎15 x 6 x 15 inches
  • Material : ‎Iron
Max water 2 Stage Whole House Standard Home Water Filter System
  • Product Dimensions : 6 x 11 x 15 inches
  • Item Weight :10 pounds
  • Manufacturer : Max Water

1. Max Water 6-Stage Aquarium Reverse Osmosis System

This model brings something new to the table for anyone looking for a reverse osmosis system for their aquariums. Even after being stripped away, the magnesium and calcium are returned to the water. This will help to improve the water’s cleanliness even more.

The unit has a high output rate of 120 gallons of water per day. It will provide 80 gallons of water per day even at its slowest setting. At this rate, you should never be without fresh, clean water for more than an hour.

Another excellent feature is the DI filter, which is known for removing ions from water in order to stabilize the pH level. The system includes everything you need to get started filtering water, including a pressure gauge to monitor when the carbon pre-filters need to be replaced.

Main Features

  • Relatively low-cost.
  • Filters that are reasonably priced.
  • Able to remove chlorine permanently
  • Six stages of the filtering process
  • A low waste-to-water ratio.

The things that might be bothering you: It only takes a few minutes to mount the water.

2. Max Water 5 Stage Home Reverse Osmosis System

The system includes a high-quality, high-performance filter that can easily last a year. The water is filtered through five different filters. Despite the fact that this is one of the more affordable models on our list, the water quality is excellent.

They eliminate chlorine, bad taste, odors, and other potentially harmful chemicals. These indicate the filter’s lifespan and alert you when it’s time to replace it. When your filter needs to be replaced, the panel will notify you. It also aids in the prevention of filter blocking, pressure imbalance, TDS creep, and system overload.

This 5-stage under-sink reverse osmosis system provides pure, clean water. This system is ideal for use in the home aquarium and kitchen and for producing pure water for ice makers and refrigerators.

Main Features

  • Readings of 10 or fewer ppm.
  • The system is well-built and designed by RO water experts for maximum efficiency.
  • The ability to upgrade it to a whole-house RO system.
  • Water with an exceptional flavor.
  • Installation is less difficult than you might think.

The things that might be bothering you: In comparison to other systems, more water is wasted during the purification process.

3. 3 Stage lime Anti Scale Inhibiting 10″ Clear Whole House Water Filtration System

This whole-house water filter filters your water through three stages before softening it for use. It removes common contaminants with two carbon filters, then moderates bacteria and algae growth with a copper-zinc media filter, which reduces cloudiness and filters life.

The first pressure gauge reads your feed water pressure and the outgoing pressure from the first stage, and the second gauge reads the outgoing pressure from the second filter.

The second gauge is used to read the second filter’s incoming pressure.

This filter is extremely effective, removing any particle larger than 1 micron from the water.

The resulting water will be crisp and clean, having gone through an activated carbon filter before reaching your faucet. So, by installing this system, you can combat hard water while also reaping the benefits of soft water.

Main Features

  • This water filter can remove up to 95% of contaminants.
  • It removes iron, sediment, manganese, and other chemicals effectively.
  • Filtration is done in three stages.
  • Removes the sulfur odor from water.
  • Filter life is extended.
  • Completely assembled package.
  • It comes with a user manual.

The things that might be bothering you: If your water source is heavily contaminated with iron, this system may not be able to remove it completely.

4. Max Water 3 Stages 10″x 2.5″ 3/4″ Port Whole House Iron Manganese Water Filter

This filter unit has a three-gradient filtration system and a 1-inch outlet. It cleans water of chlorine, rust, herbicides, sediment, pesticides, industrial solvents, and other contaminants.

Your fish will enjoy clean water right away thanks to its engineered high-flow rate filtration, and the unit will not cause a noticeable drop in water pressure.

When you notice changes in the readings, it’s best to replace the filters; an increasing pressure drop is a good indicator.

As the water inside the system can pass through the filters normally, the cartridges become clogged with particulate, or the filter’s media is exhausted.

Main Features

  • Fits most standard 10″ housings and reverse osmosis systems.
  • Manganese Water Filter is both effective and cost-effective.
  • White filter housings are both long-lasting and inexpensive.
  • To avoid breaking the filter, use a plastic housing wrench for 10″ systems.

The things that might be bothering you: If you do not use Teflon tape to seal the connections on this water filter, it may leak.

5. Max Water 2 Stage Whole House Standard Home Water Filter System

This two-stage system is less expensive than its three-stage cousin but has the majority of its capabilities. It reduces contaminants like lead and industrial chemicals that are most likely to enter municipal water supplies. Its superior catalytic carbon filters excel at removing chlorine and chloramines.

Chlorine, sediment, pesticides, rust, VOCs, industrial solvents, and other contaminants can be removed from your water by these high-quality filters up to 95 percent of the time.

The built-in pressure relief valves allow you to quickly and easily remove the filter housing to replace the filter cartridge every 6 months. The typical flow rate for this 2-stage filter is 3 GPM, with a maximum flow rate of around 6 GPM.

Main Features

  • Installation is simple for the average homeowner.
  • Removes impurities that affect the taste of water.
  • Replacement cartridges that are reasonably priced.
  • Low-maintenance.

The things that might bother you: Not suitable for well water.

Frequently Asked Questions

How long does it take for tap water to be safe for fish?

Dechlorination of tap water takes at least 24 hours. In some cases, it can take up to 5 days for the chlorine to completely evaporate from your water.

Can I add a water conditioner while the fish are in the tank?

Because water conditioners are generally safe to use, you can use one while the fish are in the tank. However, it is best to remove the fish in small and overcrowded tanks for at least 15 minutes.

How do I know if my tank is ready for fish?

When your ammonia levels are rapidly dropping over the course of a day and your nitrite level has risen and then dropped back to 0ppm, your tank is ready to accept fish.

How long does it take for good bacteria to grow in a fish tank?

In a new aquarium, it usually takes 4-6 weeks for beneficial bacteria to grow and complete the nitrogen cycle. It is not uncommon for seeded aquariums to fully cycle in half the time it would normally take, allowing you to stock the new tank with more fish sooner.

Final Word

A reverse osmosis system is a cost-effective way to produce high-purity water in large quantities for your aquarium. However, a long-lasting one requires an excellent investment to run for a long time, so you will have to spend more money purchasing a high-quality purifier.

 A RO/DI filtration system, on the other hand, is not required if you own both saltwater and freshwater tanks.

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