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Water Hardness and pH in the Freshwater Aquarium

This is a discussion on Water Hardness and pH in the Freshwater Aquarium within the Member Submitted Articles forums, part of the TFK Resources category; --> Byron, I've come across a confusing situation. Why would tap water with a pH of 7.4 rise to around 9 after aging in a ...

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Water Hardness and pH in the Freshwater Aquarium
Old 05-31-2012, 04:22 PM   #11
 
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Byron, I've come across a confusing situation. Why would tap water with a pH of 7.4 rise to around 9 after aging in a bucket of water within 24 hours? Could a city add buffer that keeps it rising?
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Old 05-31-2012, 04:33 PM   #12
 
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Byron, I've come across a confusing situation. Why would tap water with a pH of 7.4 rise to around 9 after aging in a bucket of water within 24 hours? Could a city add buffer that keeps it rising?
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In this situation, it is due to the out-gassing of CO2. Tap water has CO2 dissolved in it, in varying amounts depending where you are and how they treat the water and how far it travels. CO2 lowers pH by creating carbonic acid, just as happens if you diffuse CO2 into a planted tank. By letting the tap water stand 24 hours, the CO2 will dissipate out, and the pH will naturally rise accordingly, to its actual level. You can also shake it vbery briskly in a jar to out-gas the CO2. And you should always do either before testing pH, in order to get a more accurate reading--as you've seen, it changes.

A change from 7.4 to 9 is quite a bit, and I've no idea if this is solely due to the above of some other additive. Contacting your water folks on this may be advisable, it is good to know just what is in the water.
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Old 07-01-2012, 12:33 PM   #13
 
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Byron could you help me... I have some calcium build up on the back on my tank could you tell me how to get rid of it?
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Old 07-01-2012, 12:38 PM   #14
 
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Byron could you help me... I have some calcium build up on the back on my tank could you tell me how to get rid of it?
Use vinegar (but not in the tank's water if this is inside) on a sponge or maybe paper towel; if it is really caked on, a scraper might be needed. A razor blade can work but it may scratch the glass. Rinse well with plan water afterwards.
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Old 08-28-2012, 04:22 AM   #15
 
The article is very helpful, thx!
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Old 11-01-2012, 12:55 PM   #16
 
Just what i was looking for. Thanks so much Very enlightening. Will be referring back to this
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Old 01-10-2013, 02:59 PM   #17
 
Your explanation is the first of these parameters that is lucid enough, without being condescending, for those of us (especially me) who are semi-literate in chemistry to understand. 1 year of college chemistry about 55 years ago.

Thank you many times over!!
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