Replace evaporated RO or Distilled water with remineralized?
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Old 01-07-2013, 10:17 PM   #1
Rob in Puyallup
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Replace evaporated RO or Distilled water with remineralized?


Just curious here...

Stupid question, perhaps:

When topping off a tankful of remineralized RO or Distilled water, should one add minerals to the replacement water? Do the minerals in the tank get used up or somehow absorbed/stored by the substrate, plants or critters within a tank?

Thanks!
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Old 01-07-2013, 11:21 PM   #2
jmowbray
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I have always TOed with RO/DI water. But that's how I have always learned with SW tanks.
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Old 01-07-2013, 11:26 PM   #3
Rob in Puyallup
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Yeah, with saltwater tanks the salt doesn't evaporate with the water, the specific gravity increases as the water leaves. So topping off with fresh, unadulterated RO or distilled water makes sense.

Guess my question should be:

"Does gh and kh increase in a freshwater tank as the water evaporates?"


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Old 01-07-2013, 11:56 PM   #4
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I'm pretty sure only H2O evaporates, and everything dissolved stays in the body of water.
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Old 01-08-2013, 12:06 AM   #5
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Top off with RO/DI water with NO minerals added.
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Old 01-08-2013, 12:48 AM   #6
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Quote:
Originally Posted by Cthulhu View Post
I'm pretty sure only H2O evaporates, and everything dissolved stays in the body of water.
Quote:
Originally Posted by Bluek24a4 View Post
Top off with RO/DI water with NO minerals added.
+1.

Just top off with RO/DI water. The amounts of minerals that are used up by plants is probably negligible compared to if you were to top off using remineralized water (this would probably increase the GH and KH).
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Old 01-08-2013, 06:12 AM   #7
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Thanks all!
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Old 01-09-2013, 02:22 AM   #8
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You can test the GH and KH etc through the week. If the plants are using a lot of Ca and Mg, and you find the GH dropping for example, then it is OK to top off with water that adds back just the amount of minerals you need.

However, in my low tech tanks the plants did not use the minerals that fast, so top off with rain water was helpful after using tap water through the summer. TDS climbs through the summer unless I do a really big water change.
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