I use traditional Elos kits for Alk and Calcium. Alk because that test is SO fast and easy. Calcium because the Hanna version is complained about often.
Here's my experience using the Phosphorus ULR the other day.
Test 1 - 18 (0.055 ppm) spilled a small amount of reagent outside tube.
Test 2 - Lost track of time mixing the reagent and it reset. Reagent wasted!
Test 3 - 3 (0.0092 ppm)
Test 4 - 4 (0.012 ppm)
I honestly didn't think I spilled much on the first go but I sure HOPE that explains the wildly different values. Keep meaning to make a little funnel but get impatient lol. Tests 3 and 4 were very close so I'm sorta confident my levels are very low at the moment.
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