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Thread: Using RO/DI water

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    Default Using RO/DI water

    Coming fresh out of the Reef hobby and getting back in to Discus I am sure you could imagine I have on hell of a RO/DI unit. After reading a bunch on freshwater tanks in the past couple days I have come to understand that I can’t use pure RO/DI water by itself. I will either have to re- mineralize it or mix in tap water.
    I live somewhat in the country. I have not checked my water chemistry yet but I think my water is very high in minerals with an avg 320tds before it goes in to the unit and as the water sits in my toilet bowls I get a black ring around the bowl. Plus I do know the water is high in CO2 as I go through DI resin quickly. Have 2x 60 gallon holding tanks.
    What is everyone’s suggestions on how I should prepare my water?

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    Moderator Team Adam S's Avatar
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    Default Re: Using RO/DI water

    320ppm isn't bad at all. I've kept wild hypancistrus and peckoltia for extended periods in 460ppm with no problems. Definitely age/agitate the new water. It should only take a few hours if you use a pump, longer for airstones. I don't bother heating new water if the temperature is within 10F, but a lot of people prefer to heat it.

    If you feel strongly about using RO, you can ditch the DI unless there's something specific you're trying to remove. The 10-20 increase in TDS just isn't a big deal in this case.

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    Default Re: Using RO/DI water

    I’m not dead set on using ro water. If I can eliminate and simplify things for me I’m all in. When you say “age the water” what are yo referring to? is ther any kind of buffers or additives that should be added to the water?
    So use regular old tap water for such a beautiful fish?
    Of course I know I have to dechlorinate the water
    Last edited by MarcVargas; 09-12-2018 at 06:33 AM.

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    Default Re: Using RO/DI water

    My meter is dead, but I believe my TDS is in the 420 range and my discus do great in this water. I only use RO for breeding and then mix in tap beginning just a couple of days after hatching. No other additives are needed.

    Aging the water means to fill a storage tank and use an air stone or circulating pump to off-gas the Co2 and stabilize ph then pump it into your main tank during water changes. If you have chloramines in your water, an additive such as Prime will instantly break the chlorine-ammonia bond.

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    Moderator Team Adam S's Avatar
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    Default Re: Using RO/DI water

    By age, I mean letting the pH stabilize. Pumps/vigorous agitation speed up this process. My 55 gallon barrels take about 3 hours with a 950 gph pump attached to a 10' hose. I clamp the hose to the barrel so the water splashes as it returns.

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    Default Re: Using RO/DI water

    I think the black ring is either manganese or iron. I don't think either will cause significant problems with discus. Stability and consistency is more important than hitting a specific number. If RO helps you get the stability and consistency you need then why not use it?

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