Question about API pH reading. - The Planted Tank Forum
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post #1 of 2 (permalink) Old 12-02-2015, 06:11 PM Thread Starter
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Question about API pH reading.

When I test my water using the standard pH test it comes out completely blue (7.6+) but when I use the high range pH test it gives me the amber color (7.4). Am I doing something wrong or is my pH likely just between 7.6 and 7.4?
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post #2 of 2 (permalink) Old 12-02-2015, 06:28 PM
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If you are following all instructions carefully, and comparing with the color chart as best you can, then yes, it's likely just between those two.

The API test kit is a great introductory kit for keeping tabs on general water parameters, it isn't designed for super specific readings like a $100 electronic ph meter.

Two other things to take into account are:
1) do you know how old the test kit is? Check it's expiration date to ensure the chemicals aren't years out of date.
2) If you are testing the ph of your tap water, that may have dissolved carbon dioxide in it, and if so, your ph will change when the water has sat out for a day. So don't worry too much if your tap and tank water have different ph readings.

Let me know if you have further questions.
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