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post #1 of 5 (permalink) Old 04-10-2015, 02:17 AM Thread Starter
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Water Changes

I was wondering can you use distilled water for water changes?

Thanks
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post #2 of 5 (permalink) Old 04-10-2015, 02:22 AM
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Originally Posted by ffmd212 View Post
I was wondering can you use distilled water for water changes?

Thanks
It has no minerals in it, you would have to add some... seachem equilibrium and baking soda would have to be added to get any GH/KH. Why bother with distilled?
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post #3 of 5 (permalink) Old 04-10-2015, 02:42 AM
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It would effectively be the same as using RODI (reverse osmosis deionized) water, which also requires adding minerals unless you do some kind of mix-down with tap water. That said, some distillation methods end up adding metals from the condenser coils, usually aluminum or zinc traces.


If you already have an established tank, I'd suggest changing water with whatever you originally filled with. The only reason to use any kind of DI water is to reduce hardness...

If you need to reduce hardness for some reason, you will need to slowly phase distilled/rodi in as part of your water changes.. sudden drops in hardness can kill fish, as it affects their osmotic balance with the water, and their bodies need to adapt to the changes.

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post #4 of 5 (permalink) Old 04-12-2015, 03:45 PM
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I highly recommend starting DI introduction straight away.

Purity of source water is a highly overlooked benefit of DI source. If you use tap or mix down tap/RO/DI, you are basically using Swill (An unknown, wildly varying, heavy metal laden, chemically sanitized solution in water).

Just start with the purest source you can (DI is 99% pure water with 0tds, 0 metals, 0 ammonia/chlorine/chloramines/nitrite/nitrate/fluorine) and add only what you want (Calcium, sodium, ferts).

To avoid hardness shock to fish, do your refills direct from DI outlet line into tank, remineralizing for new water as you go.
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post #5 of 5 (permalink) Old 04-13-2015, 12:12 AM
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If your water is more laden with heavy metals than your ferts (and your ferts *are* laden with them), I suggest you contact the EPA right away.

If you water has less than 1/10th the contaminants of your water, then you are wasting your time, at least on heavy metal concerns...

That said, certainly the chemical sanitizer concerns are reasonable... we have dechlorinators for all that, but it is nice when you don't need them.

If you do go pure DI, pay special attention to your reminieralizers... There's a lot of stuff in water that *belongs* in the water... Consider a Ca/Mg combination GH booster, bicarbonate alkalinity booster, and even a tiny bit of aquarium or reef salt (chloride is essential in tiny amounts), in addition to macro/micro fertilizers that we all need.

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Last edited by mattinmd; 04-13-2015 at 12:35 AM. Reason: more perspecitves
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