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Results 1 to 10 of 12

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  1. #1

    Default use rainwater instead of tap water

    0 Not allowed!
    Hi is it possible to use rainwater instead of tap water for the fish tank.
    I have a nine thousand liter tank and a 1.2 thousand rainwater tank.
    Rain is collected of a 20 cement tile roof, currently only used for my orchids.
    Many thanks in advance

  2. #2


    0 Not allowed!
    WOW. That tank is massive... upwards of 2000 gallons. What fish do you keep?

    If you live in or near a heavily urbanized area, there could be toxins from pollution dissolved in the water. Apart from this, you would need to check your water chemistry to make sure it is suitable for the fish you want to keep. Especially since it is collected from a cement roof.
    <-- Click for journals
    "There is no right way to do the wrong thing." - KingFisher "Only bad things happen fast in this hobby" - Cliff Boo train boo train boo train boo train woohoo

  3. Default

    0 Not allowed!
    What Aeonflame said plus you would have to constantly monitor your source water because it would be changing all the time with no way to regulate the various parameters. Is this going to be an outdoor tank like a pond or something?

  4. Default

    0 Not allowed!
    I knew someone who used to use rainwater from an un-treated tile roof, and it worked out well. But as mentioned in other posts, if you're in an urban area this could cause a problem. My buddy was in the country, and still filtered the water through activated carbon for a few days before using it. He didn't test it for anything beforehand, but I imagine that was wreckless... you should if you can.

    I would totally try it. :)

  5. Default

    0 Not allowed!
    As was said before the main thing to keep in mind is the surface it is draining off of.

    Rain water is also going to be extremely soft. You didn't mention what types of fish you have but that may or may not be what you want. I know a good number of people use rain water for water changes. Specifically people who keep fish that prefer low PH like Apistogramma.
    Last edited by Zander; 11-18-2012 at 12:27 AM.

  6. #6


    0 Not allowed!
    I collected rain water once and was surprised how dirty it was. Smoke stacks, fireplaces, planes spraying for insects, etc. I wouldn't use it.

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