Tag Archives | water conservation

Aquarium Tips of the Day | You can Recycle your RO/DI Waste Water

Today’s Aquarium Tip Tank tip of the day will help you be a little green and save a little bit of water. First, we recommend that you use a water filter to perform reverse osmosis and DE-ionize (RO/DI) your tap water before using it to make saltwater, top up your tank with freshwater, or use it for your freshwater aquarium water changes.  However, when a stream of  water is pushed through an RO membrane, two streams of water exit the membrane. One of these streams of exiting water is waste water containing the concentrated contaminants that were removed from the other, purified stream of water that you are going to use for your aquarium.  In fact, there is usually about 4 gallons of concentrated waste water produced for every gallon of purified water.  Doesn’t that seem like a waste of water? Just recycle it!

No, we’re not talking about saving it in containers and putting it through the RO/DI unit again. What we’re talking about is using it to water your house plants, water your lawn and garden, or wash your car. We’ll admit that there are a few logistics that you might have to work out to make this a viable solution for you. After all, getting 20 gallons of RO/DI purified water to change the water in your 100 gallon tank will produce 80 gallons of contaminated waste water.

You will have to find large containers for this waste water and figure out a way to move those containers to the spot where you’re going to re-use the waste water. Maybe your RO/DI filter is in your garage or your basement and it wouldn’t take much effort to run the contaminated water hose to a series of large, water tight trash cans? Or, maybe you only have  a 20 gallon tank and you only need 5 gallons of RO/DI purified water to perform a water change. In that case, you would only need one large, 20 gallon container for your concentrated waste water.

The topic of moving large volumes of water around could produce several more aquarium tips. For now, just know that there are ways to recycle your RO/DI waste water and use it around the house if you don’t want to dump it all down your drain. Also, you might spend some money on the water that you run through your RO/DI unit, but if you recycle your waste water, you won’t have to pay anything for the water you use to water your lawn!

Do you recycle your RO/DI waste water? How do you do it? Leave comments below!



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