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Yeah I did. The tapwater was referring to the water already inside my tank. I wanted to test it before introducing Distill water. Then I tested both the NTUC and my tank's water separately and realise both reading is above 200 thus didnt proceed with the distill water. Now all start to make sense. Haiz.....Meant that the Bulk order person gave me the wrong item. In Short, the Phosphorus Tester is unable to do reading beyond 0.6ppm since 200 is the max it can go.