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Old 03-09-2015, 11:53 AM   #1
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pH issue

Alright so for my freshwater tank, I've always used tap water. Out of the tap, the pH is 8.0. We have a "descaler" on the house because of all the hard water marks it leaves in our showers, sinks, etc. The dKH out of the tap is 7. What I find most interesting, is that the RODI unit I use for my saltwater tank reads 4 ppm of TDS. Yes, only 4 PPM! With it being extremely low, how can my water be this "hard". I have a feeling that it's extremely high in calcium content but low in minerals, toxins, and everything else that make up TDS. This would also explain why the KH is so high and I can't adjust my pH levels. Thoughts??? I'm at a loss.

PS- 4 ppm of TDS was before adding the "descaler" onto the plumbing.
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Old 03-09-2015, 11:59 AM   #2
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What I mean is, High KH but low GH. Thanks!
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Old 03-09-2015, 05:48 PM   #3
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Long story short, you will have to lower KH in order to lower your ph... There's a thread going on here right now that uncgirl started on ph problems. It is a really good read, lots of info on GH/KH/ph.



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Old 03-11-2015, 11:38 AM   #4
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My dKH is only at 7 right now out of the tap
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Old 03-11-2015, 12:06 PM   #5
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RO/DI water, without any exchange of CO2 with the atmosphere, will be around 7.

If you have 4 ppm of carbonate in there, that will increase KH and pH further.
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