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.
Do you have well water? If not, just contact your utitlity department and ask for a report on your municipal water. All those parameters will be there measured much more accurately than most of us have access to.
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