The question I always had with the Hagen test is "Does the first drop
count?"


"Henry" wrote in message
...
Thank you for your interest.

Both tests are similar: one takes 5 ml of water and adds drops of the test
solution one drop at a time. When the water in the test tube changes from
blue to yellow, you record the number of drops it took. In the Aquarium
Pharmaceuticals test kit one drop is worth one degree of hardness. In the
Hagen kit one drop is worth 10 ppm.

Both kits are newly purchased within the last month.


"PérRµ§h" wrote in message
...
On Sun, 9 Mar 2003 20:39:20 -0500, in rec.aquaria.freshwater.plants
"Henry" verruimde onze geest met:

What brand of test kits are people out there using ? I have two kits
(Hagen
and Aquarium Pharmaceuticals) for KH hardness, and they are giving me
different results. One says my water is about 60 PPM carbonate
hardness,
and
the other says about 90. These differing results are consistently
repeatable. Is there a brand out there that I can really trust?

I want a pretty precise result for the KH hardness so I can determine
the
C02 levels on my water with a reasonable degree of accuracy.

Thank you for any help.

Henry,

can you give me the exact procedure both tests require ?

What color change ??
what color have the liqiud(s) / solid(s) ??
In which way do you have to apply them ??
...
all other things you can imagine which can expose the nature of the
chemicals.

***

Most of these tests you measure the acid-absorbtion-capacity which is,
under normal circumstance, almost the same as the KH. But other ions,
such as PO4, interfere with the measurment. It can be that one test
exclude that or such ions.

Perrush
PérRµ§h

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