Just seen this post, I have the exact same problem and literally 30 minutes after changing the ROWAPHOS. Re-tested with same result, tank water Po4 is lower than the reactor outlet.....I am using a Hanna ULR Phosphorus tester.
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Just seen this post, I have the exact same problem and literally 30 minutes after changing the ROWAPHOS. Re-tested with same result, tank water Po4 is lower than the reactor outlet.....I am using a Hanna ULR Phosphorus tester.
Out of curiosity I almost doubled the amount of Rowaphos in the reactor yesterday. Today (in the morning - I usually measure levels at 8pm) phosphates in the display measured 0.3... Reactor output at the same time was 0.15.
So the more I try to remove phosphate the higher the reading I seem to get in the display. I'm guessing this is just a reflection of the amount that has been bound up in rock and substrate?
Ok, so I'm not feeding differently or doing anything different other than increasing the amount of Rowaphos. I measured at the usual time this evening and I was getting around 0.3 in the tank and from the output.
The more I try to lower phosphate the higher the reading I'm getting...
How are you rinsing your vials now, may I ask you?Now it all makes sense...
Apparently multiple rinses with RO water is not enough to get the vial completely clean, resulting in higher readings.
The Rowaphos has done it's job... surprise surprise...