How To Setup A Reverse Osmosis System For Your Aquarium

Your aquarium is filled with water and fish, which should all be good. And yet, some people aren’t really satisfied with the quality of water in their home. In addition to testing and regular maintenance, it’s important to use the best reverse osmosis system for aquarium to improve the quality and health of your fish’s environment.

A reverse osmosis system removes toxins and heavy metals from tap water before it goes into your fish tank.

Cleaning the tank this way allows you to enjoy healthy fish always even if you’re not ready for a full filter change.

How to Install a Ro System for Your Aquarium

Some people think that using a reverse osmosis system is difficult. It’s actually not that hard to install one yourself, and it can improve the quality of your fish’s environment.

If you’re installing the system on an existing aquarium, first make sure to disconnect your water supply from your old tank. Now you’ll need to purchase the following items:

  • A RO membrane (This will connect to your water tap)
  • A T tube (This will connect with the membrane)
  • A ball valve (this will allow you to control the flow of water)
  • A pressure gauge (this will tell you how much pressure is in the line)
  • Fittings that fit into each other for this type of installation
  • Hoses that are long enough to reach from your tap to aquarium
  • Rubber sleeves that will fit over the outside of the hoses

Then, follow these simple steps:

  1. Find a spot for the unit under your kitchen or bathroom sink
  2. Choose a faucet spout or water line
  3. Add your RO/DI system
  4. Turn on the water
  5. Turn on the system
  6. Enjoy the clean and healthy water in your fish tank!

Detailed Instructions for Installing an Ro System for Your Aquarium:

To install the system:

  1. Connect your T tube to your membrane and then to your ball valve. This is where you’ll control the flow of water.
  2. Connect one end of a hose to your RO system and the other end to your aquarium.
  3. Connect a rubber sleeve to each end of a hose using an elbow fitting that fits over it, then connect it with another rubber sleeve using another elbow fitting that fits over it (this will prevent leaks).
  4. Turn on the tap and let water run through until there’s about 3 inches in the line (this will remove any air bubbles). Now you can turn on the valve and fill your tank.
  5. The system will deliver water at about 2 gallons per minute, so it will take about an hour to fill a 55-gallon tank.
  6. Make sure you have a drain valve installed in your aquarium and that it drains into an easily accessible part of your house such as a laundry sink or tub (so you can drain the tank when doing water changes).
  7. You’ll need to test the pH, hardness and temperature of your tap water before installing the RO system to see what kind of mineral content is in it. If it has too high a mineral content, you’ll need to use some sort of media filter after the RO system to remove them from the water before adding it to your aquarium.
  8. To test the pH of your water, you’ll need to buy a pH test kit that can be found at most pet stores. Follow the directions on the box. If your tap water is acidic (lower than 7 on the pH scale), you should use some sort of buffer after the RO system to raise it to a more acceptable level (the ideal pH for an aquarium is between 7.2 and 8).
  9. To test hardness in your water, buy a hardness kit from a pet store or hardware store that will tell you how many grains per gallon are in it (you can also find this information on most water treatment kits). You want that number to be less than 10 grains per gallon so that you don’t have to use a special water conditioner like RO-90 after the RO system.
  10. To test your water temperature, place the thermometer in a container of water and check it with a refrigerator/freezer thermometer to make sure it is close enough to 32 degrees Celsius (90 degrees Fahrenheit). If your tap water is too cold, you can warm it up by running it through an aquarium heater for about 15 minutes before putting it into the RO system.
  11. You’ll need to buy some filter media that will be used after the RO unit to remove any extra impurities from the water before adding it to your aquarium. The most common media used is activated carbon, which can be found at most pet stores or hardware stores. It can be used to remove any chlorine and chemicals from the water. There are other types of media, such as Poly-Filters, which can remove heavy metals, nitrates and phosphates from the water.
  12. You’ll also need a way to make sure your RO system will not leak when it is not in use. Many people use a simple bucket to catch any potential leaks before they get into their aquariums.
  13. Another thing you might want to consider is getting a TDS meter . This handy device can measure how much Total Dissolved Solids (TDS) are in your tap water or RO water. Most tap water usually has a TDS level in the 200-300 ppm range. RO water usually comes out around 10 ppm, which is very low and safe for your aquariums.
  14. You’ll also need to buy a way to measure how much water you are adding to your aquarium each time you do a water change. There are several different ways to go about this, but the easiest way is to use an automatic doser or an automatic siphon system.

What Are Some of the Best Reverse Osmosis Systems for Aquariums?

Here are some of our favorite Reverse Osmosis Systems that work great for aquariums:

Reverse osmosis installation

Benefits of Using a Reverse Osmosis System for Your Fish Tank

A reverse osmosis system removes toxins and heavy metals from tap water before it goes into your fish tank. This will not only clean the water, but also prevent the chance of algae growth.

It’s also important to use a reverse osmosis system because it prevents the need for chemicals in your aquarium. The natural minerals in the water are left intact, which is healthier for your fish.

Another benefit of using a reverse osmosis system is that you can maintain healthy bacteria levels in your tank without adding new chemicals or additives. Maintaining healthy bacteria levels also helps prevent fish disease outbreaks.

Is Reverse Osmosis Good for Fish Tank?

A reverse osmosis system removes toxins and heavy metals from tap water before it goes into your fish tank. This makes your tank cleaner and healthier for the fish in it.

With a reverse osmosis system you can do less work to maintain the quality of your aquarium, while also keeping your fish healthy.

How Do You Remineralize RO Water in a Freshwater Tank?

One way to remineralize RO water in a freshwater tank is to add aquarium salt. The natural minerals in the salt will help balance your fish’s pH and make their environment feel more like the ocean.

Can I Install a Reverse Osmosis System Myself?

Many people install a reverse osmosis system themselves. If you’re interested, you’ll need to purchase a filter from an aquarium store.

For those who may not be as handy as they’d like to be, or those who don’t want to bother with installation, there’s another option: Aquarium professionals may install the filter for you for a fee.

Can You Use RO/DI Water for Freshwater Aquariums?

The water you use for your freshwater aquarium should be safe and healthy, but it can also differ depending on which fish you have. Some freshwater fish, like goldfish, need hard water to thrive. But other fish need softer water.

One option is to use tap water with a reverse osmosis system. Tap water that has been filtered through an RO/DI system can help to create the perfect environment for your fish because it removes toxins like chlorine and heavy metals.

Your fish’s habitat will be clean and healthy even if you’re not ready to make a full filter change.

How to Install a RO/DI System?

If you’re looking to install a reverse osmosis system in your home, there are two main parts that need to be installed. The first is the RO/DI system itself. To install this, you’ll need to cut off the water line to the tank and then run tubing up to the top of the tank.

The second part is a pressure gauge which needs to be installed on the tank. This will let you know when water builds up in the tank.

The RO/DI system can be installed in your home quite easily with these steps. It’s an important investment for any aquarium owner!

How to install a RO/DI system? EP: 2 Aquarium Reverse Osmosis


Can algae grow in RO water?

Yes, algae can grow in RO water. However, the water will be clean and safe to drink even if algae is present.

How does a reverse osmosis system work in an aqurium?

Essentially, a reverse osmosis system is a water purifier. A membrane with very small pores is used to separate the water from the impurities inside it. The membrane filters out anything from sulfate to heavy metals that you don’t want in your tank.

What are the benefits of using a reverse osmosis system?

The use of this type of system for your aquarium gives you clean, clear and healthy water for your fish. It also saves you money especially if you’re on a tight budget and cannot afford regular filter changes or other aquarium maintenance procedures.

How often do I need to change my filters?

If you have a small tank, you may need to change your filters every three months. Larger tanks, on the other hand, need changing every six months.

How do I maintain my filters?

Rinse your filter pads with tap water and replace them if they are too dirty or worn out. You may also clean them with a mixture of water and vinegar. Rinse the membrane regularly to keep it working efficiently.

What can I use to clean my filters?

You can use vinegar or a solution of water and vinegar to clean your filter pads, while a solution of water and bleach is effective in cleaning the membrane in your reverse osmosis system tank.

Why do I need a reverse osmosis system for my fish tank?

You need this system to remove harmful chemicals from the water. It also helps in keeping your fish healthy because it removes harmful bacteria and other contaminants.

What are the benefits of a reverse osmosis system?

This type of system is beneficial because it is inexpensive and easy to use. It also gives you clean and clear water for your fish as well as fresh drinking water for you and your family. It also saves you money on buying bottled water, as well as regular maintenance costs for your aquarium, such as changing filters, adding chemicals and so on.

How do I know if my reverse osmosis system is working properly?

If your reverse osmosis system is working properly, the water will taste and smell clean. You will also be able to see that it has removed cloudiness from the water.

How do I clean my reverse osmosis system?

You should clean your reverse osmosis system about once every two months to prevent build-up of sediment and mineral deposits in the pipes, as well as clogging of filters. You can use vinegar or a solution of water and vinegar to clean your filter pads, while a solution of water and bleach is effective in cleaning the membrane in your tank.

What should I do when my reverse osmosis system starts making a noise?

If your reverse osmosis system starts making a noise, you should check the membrane tank to see if there is any blockage in the filters. If there is no blockage, it may be time to replace the filters.

What should I do if I have too much water in my tank?

You should drain out the excess water to prevent overflow and ensure that your system runs efficiently. Do not operate your reverse osmosis system if it has been drained due to excess water because it will not work efficiently.

How often should I replace my reverse osmosis membrane?

The life of your reverse osmosis membrane depends on how much water you produce, the quality of water you use, and how well you maintain your system. However, it is recommended that you change your membrane once every three years.

How can I avoid a problem with my reverse osmosis membrane?

You should make sure there is no debris in the tank that could block the flow of water through the filters or damage the membrane. You can do this by regularly cleaning your system.

How do I clean my reverse osmosis system?

You can clean your reverse osmosis system by flushing the membrane tank and filters with a mixture of vinegar and water. This should be done at least once a year and more often if you notice that your water tastes or smells bad or has particles in it.


Reverse osmosis systems are popular with aquarium owners because they help to purify and remineralize the water in your fish tank. The system is usually installed under the sink and can be hooked up to a faucet or connected to a water line. The RO membranes remove all the impurities from the water and the DI resin remineralizes the water with calcium, magnesium, and strontium.

Meet the author: Paul White

Paul is water engineer by trade and is very passionate about innovative solutions for water filtration. His goal is to make drinking water accessible and affordable to all. An avid runner, he is currently training for a marathon. “Running is my sanity. Writing is how I organize my thoughts. I’m a poet and writer who is passionate about change. I aspire to be the best version of myself, and to help others do the same.” Learn more about Paul and the rest of the team.