Help interpret town water report. - The Planted Tank Forum
Old 04-02-2010, 05:45 AM Thread Starter
Algae Grower

Join Date: Jan 2010
Posts: 73
Help interpret town water report.

This is an exerpt from my town water report. All units are ppm.

Hardness by Calculation
- Calcium (Ca) - Total 8.85
- Hardness (as CaCO3) 31
- Magnesium (Mg) - Total 2.09

Organic Nitrogen
- Ammonia - N, Total <0.020
- Total Kjeldahl Nitrogen 0.097
- Total Organic Nitrogen 0.097

Treated Water Chemistry
- Alkalinity, Total (as CaCO3) 11.1
- Chloride (Cl) 3.31
- pH 6.86

Individual Analytes
- Dissolved Organic Carbon 3.2
- Iron (Fe) - Total <0.050
- Nitrate - N (NO3-N) 0.078
- Nitrite - N (NO2-N) <0.020

Am I right to assume that my GH is 31ppm and my KH is 11.1ppm?
Why are the Hardness and Alkalinity both expressed as CaCO3?
Assuming the GH is 31ppm, what makes up the remaining ppm's if the Ca and Mg are only a total of 10.94? I thought Ca and Mg were the major contributors to GH. Here, they're only a third of the total.
Tuiflies is offline

Old 04-02-2010, 01:41 PM
Planted Tank Enthusiast

Join Date: May 2004
Location: Oshkosh, WI
Posts: 738
Quote:
Originally Posted by Tuiflies View Post
Am I right to assume that my GH is 31ppm and my KH is 11.1ppm?
Why are the Hardness and Alkalinity both expressed as CaCO3?
Assuming the GH is 31ppm, what makes up the remaining ppm's if the Ca and Mg are only a total of 10.94? I thought Ca and Mg were the major contributors to GH. Here, they're only a third of the total.
Yes on the GH and KH numbers.

Hardness and alkalinity are both expressed as CaCO3 EQUIVALENTS - this is the amount of CaCO3 that you would add to pure water to get the same test results. Since hardness can be different ions and alkalinity can be different bases, using a common equivalent unit allows us to compare water samples from different sources.

Ca ppm = mg of Ca per liter. CaCO3 ppm = mg of CaCO3 per liter.

So, 8.85ppm Ca * (100mg CaCO3/40mg Ca) = 22ppm CaCO3 from Ca only
2.09ppm Mg * (100mg CaCO3/24.3mg Mg) = 8.6ppm CaCO3 from Mg only
Total = 30.6 = 31ppm as CaCO3

Enjoy!

Kevin

Kevin

72g bowfront planted, CO2, 4x - T5HO, Eheim 2213 and 2217, 2 angels, pristella tetras, blue tetras, betta, albino bristlenose pleco, albino cories. Sword, vals, hygros, ludwigias, java moss and fern, anubias

2g Mac-quarium. Clown gravel, fluorescent plastic plants, and 2 guppies.
KevinC is offline
Old 04-02-2010, 01:42 PM
Planted Tank Enthusiast

Join Date: May 2004
Location: Oshkosh, WI
Posts: 738
Oh yeah - your water is great! Extremely low GH and KH - no need for an RO unit there!

Kevin

72g bowfront planted, CO2, 4x - T5HO, Eheim 2213 and 2217, 2 angels, pristella tetras, blue tetras, betta, albino bristlenose pleco, albino cories. Sword, vals, hygros, ludwigias, java moss and fern, anubias

2g Mac-quarium. Clown gravel, fluorescent plastic plants, and 2 guppies.
KevinC is offline

Old 04-02-2010, 01:48 PM
Banned

Join Date: May 2009
Location: SoCal
Posts: 1,086
Th pH below 7 surprises me for muni water. Usually they make additions to keep it over 7 to prevent corrosion in their distribution system.

Sent from my old-fashion computer with eight fingers on the home keys.
GTR is offline
Old 04-02-2010, 02:38 PM
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Location: Plainwell, Michigan
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Are these an annual average? what is the scope?

That water looks tasty!

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75 gallon "Piranha Kingdom"- wet/dry, FX5, CO2, pH controller, T5HO 4x54, ferts, SunSun Pimp Club Lucky #11, Fluval Pimp Club #17
tyler79durdan is offline
Old 04-03-2010, 02:54 AM Thread Starter
Algae Grower

Join Date: Jan 2010
Posts: 73
This was the test results for last December but it's pretty consistant. Maybe because the town water guy has fish too.
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