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Old 02/01/2018, 09:22 AM   #26
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d0ughb0y's Avatar
Join Date: Mar 2008
Location: sf bay area
Posts: 5,109
have you tested with a new or another test kit?
if not, you can verify your current tester by testing rodi water and the reading should be 0. this is just to make sure your nitrate test is valid.

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