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#1
06-30-2013, 03:59 AM
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I should also mention that sudden changes in pH is another one of the things that can probably cause damage. But I would also argue that if your discarded water has a pH that has gotten high or low enough for the sudden differential a 100% water change will result in to cause cellular damage, you've got far more serious, longer term water chemistry problems, and a a 100% water change is probably an advisable short term risk to get your system out of a dangerous zone.
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#2
06-30-2013, 04:07 AM
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ugh, three posts in a row. Put the soap box away adam.
The last thing I'd say about the real risk to 100% water changes (assuming that it's your only method of maintaining a tank) is not that it can take something like dKH from 6 to 8, it's that between the water changes, your dKH is allowed to fall from 6 to 8. It's the ongoing, day to day stability that matters, and if over a week your levels are fluctuating from very low to very high, or very high to very low and you're doing nothing in between to keep them 'stabile', you're either not doing your 100% water changes regularly enough, or you're not doing enough in between the water changes to keep things stable.
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