05-10-2012, 04:58 PM
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Originally Posted by Nemo the Clownfish
Thanks for the explanation, Byron. From the most recent MWRA report, Distribution system sample pH ranged from 9.1 to 9.6 and alkalinity ranged from 40 to 42 mg/L. And...
Total Dissolved Solids 35.0
I hope Total Dissolved Solids can help you with GH. The report explains that it is GH.
That's a fairly low KH, 40 mg/l is roughly equal to ppm, so 40ppm which is approximately 2.2 dKH. I would myself expect the pH to lower as the buffering will be minimal, but Mikaila can confirm or correct this.
So this explains where the acid comes from, presumably?
You also have very soft water, around 2 dGH though this is their TDS and I've no idea how much of this is calcium/magnesium though I would suspect most of it is.
Earlier you mentioned using chemicals preparations to adjust pH, I would counsel against this. It is better to let nature take its course. Forgotten what fish species, but soft water fish will have no issues with just letting it go naturally, although one doesn't want it too low for some. If buffering is necessary, the method I use is safest, in my case just a bout 1.5 tablespoons of aragonite in the filter buffers the 115g and similarly the 90g as mentioned previously. And this lasts years.