I appreciate the honesty. And I will work on the cya test today. To add to my confusion... I tested the water today and fc was 3.5, cc was 17.5. No surprises there. But when I checked tc with my oto kit, it was about 2 (definitely not as dark yellow as the 3ppm color). I have never seen my oto kit go higher than 2, but I know my tc is over 20. Is the reagent bad? It's a new kit early this season.