PowermanKW
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YES. Trust me I fully understand that I DO have PO4...but for all intents and purposes it is "unmeasureable". I am using a simple (brand new) API test. And again (if you read all my posts in this thread) I am not testing for accuracy, I'm simply looking for change. Weather or not my PO4 test is accurate is irrelevant, I just want to know if it goes up, down, or stays the same. The same is true for NO3. The only fact in my tank so far is that PO4 is not changing by going "up", but my NO3 is still able to go "up." this bothers me because most other users have noticed a drop in nitrates faster than the phos. But my tank has seen nothing after a few months of use. In fact my NO3 continues to go up at a steady rate. So I could care less if I have "zero" PO4, I understand that at a level undetectable on the API test, that my PO4 is probably at a good range.
just wish my trates would go down and stay down...that's what we will see after this next week (mon) after my latest WC.
Ya you got it, and I know you have been working on this problem. Honestly... IMHO... using a API is worthless. And it isn't about how accurate it is, it is that it will only really show gross PO4 amounts.
So for us, .5 is too high, (below .02) but a API is not going to tell you that. I used API and it was always zero. I got a Merck kit and it was .5. I ran GFO and it was down to .015 to .008. So I know for a fact the GFO LOWERED my PO4. Now I run EcoBak by WM. My PO4 has gone down from .015 when my GFO is exhausted to zero.... can just barely distinguish a blue tint.... below .008. That is with no GFO and one reading was a solid yellow... absolutely zero.
So while the actual number you have may not be important, you really have no idea if your PO4 levels have lowered or not using a API. It simply does not have a high enough resolution for what we are using it for. You could be anywhere from 1 to .001.