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Re: [APD] Re: RO/DI setup vs. CO2 setup
I have just purchased a new test kit and now have numbers that are on
the scale at least.
Alkalinity around 80 ppm
Total hardness around 120 ppm.
What is the primary concern with phospates? Is it just because algae
really enjoy them. I have several cory cats and sharks to do the cleanup
of the algae.
--Bryan
Tom Wood wrote:
"The area where I live in St. Louis, MO has very hard water (high GH)
also the pH tends to run around 8.0."
Hard water is not necessarily a bad thing for most plants. Test the pH
several hours after it has been out of the tap. Many municipal water
systems drive CO2 out of the water to make it less corrosive to the
pipe system. Once out of the tap, the water will take on CO2 from the
atmosphere and reach its normal pH. Ours comes out of the tap around 9
and drops to 7.6 all by itself.
"I have adjusted the pH down to neutral, with SeaChem Discus Buffer."
Discus Buffer is monosodium phosphate. Depending on how much you
added, your phosphate level is now likely measured in the hundreds of
ppm, when the desired level is 1-2 ppm. Keep the Discus Buffer for
dosing phosphate later but don't use it for pH control. Flush the tank
and start over.
"But, the water is so hard that I have been able to get an accurate
reading with my test kit. The vial fills up before the endpoint is
reached."
Which test kit for what parameter? You'll enjoy the tank longer if you
don't fight your tapwater. So in the end, the actual value doesn't
really matter.
"1) Does a test kit go "bad?""
They can, but 'user error' plays a role too. :-)
2) Would a RO/DI filter be a better purchase for the long-run than a
CO2 setup?
No, buy the CO2 setup and don't worry at first about hardness. If you
get into exotic plants/fish that -really- need soft water, then
consider RO. Most 'soft water' plants/fish do fine in 'hard' water.
Measure KH, buffer to about 3 using baking soda if needed, and then
add CO2 to get to about 20 ppm using the charts:
http://www.thekrib.com/Plants/CO2/kh-ph-co2-chart.html
You'll see that adding CO2 will also bring the pH down, but that's an
effect not a goal.
In My Opinion, others will chime in.
TW
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