API phosphate test kit - wrong colour??? - Page 2 - The Planted Tank Forum
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post #16 of 18 (permalink) Old 10-08-2020, 01:20 PM Thread Starter
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Originally Posted by vanostav61 View Post
0ppm
Exactly!

And since the only real difference between the salt and freshwater test cards is that the fresh has very light green 0ppm and the salt has yellow 0ppm, this means we're in effect using the salt water test card to read fresh water results.

API support weren't much help (don't think I made it past first line customer support to anyone with any real product or tech knowledge though). But I would really like to know why there are different salt and fresh test cards, how salt water affects the phosphate reading, and why this is only really significant at the 0ppm end.


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post #17 of 18 (permalink) Old 10-09-2020, 04:58 AM
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Exactly!
But I would really like to know why there are different salt and fresh test cards, how salt water affects the phosphate reading, and why this is only really significant at the 0ppm end.
Maybe it's more of a spectrum of the TDS. So the salt card is essentially for very "hard" water while the fresh is for "softer" water. So maybe if you have harder fresh water, it reacts more like the salt water card colors. Just reaching...
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post #18 of 18 (permalink) Old 10-10-2020, 12:33 AM Thread Starter
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Maybe it's more of a spectrum of the TDS. So the salt card is essentially for very "hard" water while the fresh is for "softer" water. So maybe if you have harder fresh water, it reacts more like the salt water card colors. Just reaching...
Good thought, like the logic! Only my water is pretty soft (6-7 GH and 0 KH). Unless it's a quirk of soft water or having 0 KH somehow?


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