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· Premium Member
7,439 Posts
When all of your readings are "off the chart" you need to first try to verify that your test kits are giving accurate results. In fact, anytime you are going to depend on your test kits to guide what you do, you should first calibrate them. That means making at least a couple of water solutions with known values of whatever the kit tests, and using the kit to see if it agrees with those known values.
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