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post #1 of 4 (permalink) Old 01-04-2013, 04:47 AM Thread Starter
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Water Question

Ok so I just want to make sure that using RO/DI filtered water is ok for my fishtank. I just recently moved and the place im living now has on so I can use it if I wanted to. I first filled the tank with regular tap water and now while doing water changes am refilling it with RO/DI filtered water. It is a fairly heavily planted tank with CO2 injection with live fish. It is also fertilized regularly with micro/macro nutrients. So is it ok to use RO/DI filtered water and will this cause PH shifts or anything else that I have to worry about? Thankyou!
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post #2 of 4 (permalink) Old 01-04-2013, 09:23 AM
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Is there any particular reason you are using RO/DI water (perhaps keeping sensitive livestock)?

If not, I would just use tap water.

RO/DI water has the disadvantage that it has essentially no minerals, so you will need to remineralize it (in addition to fertilizing your plants, which you would need to do in any case).

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post #3 of 4 (permalink) Old 01-04-2013, 04:52 PM
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Is this a whole-house system, or are there bathtub taps, etc. that aren't filtered? There are various mixes to re-constitute pure RO water (RO Right, Equilibrium), but I have tried them and wound up with some funky algaes. RO water may need additional buffering to prevent pH swings. If you have very hard tap water, you can experiment with mixing RO and straight tap water until you get the conditions you want.
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post #4 of 4 (permalink) Old 01-04-2013, 05:53 PM Thread Starter
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oh the system is only for part of the house and is used for drinking water. from the looks of it and researching a little more I think I will stick with regular tap water. The water where I live (milpitas, CA) is not extremly hard or anything and is actually quite "safe." I guess I might just mix in a little of the RO/DI water with the regular water when I do water change to make it a little softer for my fish (they are all fairly hardy fish). Thanks!
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