Do 50% water changes. I do 40% every other day ..
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I just checked the north hampton water quality report on line, published by the Aqueon Co, the average nitrate reading for last year was 1.43ppm. The highest allowable nitrate level in drinking water is 10ppm, if they had 10 or over, there would be a media blitz tell everyone to stop drinking water. The EPA would shut them down, and fine them serious money.
Water companies are required to produce water for drinking, lives are on the line.
I would suggest that you make sure your API tests are not expired, or somehow contaminated.
You should check to see that your glassware is clean
Have a pet store in your area check your water.
I worked for a water company, and aquarists would call saying the water was bad, when we checked on our equipment, they were always wrong.
Any vial used to test for nitrate should be rinsed 3 times with DI water after each use,
you should have a known standard to check your test (we used 2ppm reagent standards), and each test should be run with 3 aliquots. This is how we tested at the water plant, and each chemist tested every shift using a spectrophotometer, that cost more than my truck.
Each chemist had to prove proficiency at each test yearly, this is standard at all US water producers.