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Re: Water quality
Hi Douglas.
I'm sceptical about your reading for Total Hardness as CaCO3 (571 mg) -
that must be a typo? Have you tested your tap water yourself? That looks
like an official information sheet, but I wouldn't trust it completely, or
I'm not making sense of it correctly. 571 mg Total Carbonate hardness is
extremely high, and with a pH of 7.6, I suspect there's something wrong
some where. In any case, Daphnia magna like a high pH and high hardness, so
I would think it would do well in your water. I suspect D. pulex would do
well in those conditions too (they're generally much hardier than D. magna).
Regards,
-John
At 03:58 14/02/01 -0500, you wrote:
>Date: Tue, 13 Feb 2001 11:25:07 -0600
>From: Douglas Guynn <dguynn at nwol_net>
>Subject: Water quality
>
>Below is an analysis of water from the city where I live;
>
> General
>pH 7.6
>P. Alkalinity as CaCO3 0 mg/l
>Tot. Alka. As CaCO3 121 mg/l
>Total Hardness as CaCO3 571 mg/l
>Dissolved solids 1385 mg/l
>Bicarbonate 148 mg/l
>Carbonate 0 mg/l
>Dil Conduct 2814 (umhos/cm)
>Calcium 126 mg/l
>Chloride 469 mg/l
>Flouride 0.4 mg/l
>Magnesium 62 mg/l
>Total Nitrate 0.21 mg/l
>Sodium 263 mg/l
>Sulfate 380 mg/l
>
> Metals
>Barium 0.199 mg/l
>Chromium < 0.01 mg/l
>Copper < 0.006 mg/l
>Iron < 0.013 mg/l
>Lead < 0.001 mg/l
>Manganese 0.013 mg/l
>Nickel < 0.02 mg/l
>Selenium 0.0156 mg/l
>Silver < 0.01 mg/l
>Sodium 236 mg/l
>Zinc <0.02 mg/l
>
>Is this water suitable for raising D. magna? If not, could it be mixed with
>RO water to achieve a tolerable dilution, or should I use RO water and one
>of the mineral addititves like RO Right?