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Evaporating water..
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Oscar916
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Joined: 15 Mar 2005

PostPosted: 2005.04.19(Tue)22:39    Post subject: Evaporating water.. Reply with quote

Hi everyone,
when tank water evaporates, is the water thats left in the tank harder and with a higher pH than before the water evaporated? We have moderately hard tap water in our area with a pH of about 7.8.. And my tank water evaporates about an inch every week or week and a half..
I know that in salt water aquariums if the water evaporates that means that the salt concentration is higher in the water thats left over.
So instead of the salt, in freshwater tanks, is the water left harder than usual?
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Darkblade48
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Joined: 21 Jun 2004
Location: Toronto, Ontario. Canada

PostPosted: 2005.04.20(Wed)1:42    Post subject: Reply with quote

Yes, just like in salt water systems, when water evaporates in a freshwater tank, mineral salts (such as calcium carbonate) will be left behind in the water column, and thus, they will make the water slightly harder.
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benedictj
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Joined: 05 Dec 2004
Location: new york, ny

PostPosted: 2005.04.20(Wed)6:44    Post subject: Reply with quote

Yes, and to complicate it further, each time you add water and don't clear away the white buildup, you are further increasing your water's hardness since the mineral desposits will re-disolve.
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jersysman
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Joined: 16 Mar 2005
Location: Galesburg, Illinois

PostPosted: 2005.04.20(Wed)16:44    Post subject: Reply with quote

Is there anything that we should use to get rid of the white deposits before adding in water?
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benedictj
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Joined: 05 Dec 2004
Location: new york, ny

PostPosted: 2005.04.20(Wed)17:01    Post subject: Reply with quote

yep- put some white distilled vinegar on a paper towel and simply wipe it away, then run over it with a dry paper towel to mop up any vinegar residue. Of course try to avoid getting any vinegar in the tank...
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uLtRa
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Joined: 11 Apr 2003
Location: Southend, UK

PostPosted: 2005.04.21(Thu)3:08    Post subject: Reply with quote

How often are you waterchanging? Obviously the more frequent the waterchanges the less water can evaporate out.
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number6
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Joined: 07 Feb 2003
Location: Ontario, Canada

PostPosted: 2005.04.21(Thu)8:39    Post subject: Reply with quote

uLtRa wrote:
How often are you waterchanging? Obviously the more frequent the waterchanges the less water can evaporate out.
Can you explain this theory?
I do not see how frequency of wc would have any effect on the rate of evaporation.
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ozziegt
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Joined: 07 Mar 2005

PostPosted: 2005.04.21(Thu)9:34    Post subject: Reply with quote

When you do water changes you are going to take out the minerals that have built up in the tank due to evaporation as well.
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benedictj
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Joined: 05 Dec 2004
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PostPosted: 2005.04.21(Thu)9:46    Post subject: Reply with quote

ozziegt wrote:
When you do water changes you are going to take out the minerals that have built up in the tank due to evaporation as well.


Sort of, but if you don't remove the buildup on the sides of the tank the minerals will dilute, causing your hardness to increase over time. Similarly, if the you allow lots of water to evap without replacement, despite diluting mineral concentrations with water changes, eventually it will catch up with you (excluding the dilution of the 'tank side mineral deposits' if you will).

As always, diligence is the best approach with keeping chem stable. (just some thoughts, sorry for the ramble).
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number6
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Joined: 07 Feb 2003
Location: Ontario, Canada

PostPosted: 2005.04.21(Thu)9:56    Post subject: Reply with quote

ozziegt wrote:
When you do water changes you are going to take out the minerals that have built up in the tank due to evaporation as well.

This was not ultra's statement. His theory states less water will evaporate.

As far as I know, as evaporation occurs, if you remove a constant amount of water, and add a constant amount of water, the water level will continue to drop. Evaporation occurs.

If you refill the tank to the top, I.e. add more water in than you took out, then you negate the effects of evaporation concentrating the TDS. benedictj's point then becomes important.
This is also why you do not top up the water prior to the water change but always after.

Ultra's theory is brand new to me. I also highly doubt that it is possible.
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