I hope I didn't turn my pool into the Love Canal....

[itstoohot]

Unless I'm mistaken, 0 TC less 0 FC = 0 CC. As long as your combined chlorine is 0, then you shouldn't need to shock (in most cases). Post the results when you test this evening and the kind folk on this forum will give you guidance.

[waterbear]

The reason you tested 0 ppm chlorine is because the DPD test in the Taylor k-2005 will bleach out at high chlorine levels. It really only works up to about 10 ppm chlorine. After that you need to dilute the test sample with distilled water. If you read the intructions on the lid about diluting your sample with distilled water and look on the comparator tube you will see the markings for dilution. This will allow you to test your chlorine when the levels are high. If you have an OTO test kit (reagent turns yellow, usually found in the 2 way chlorien and pH testers) I betyou will find that it turns deeper then yellow into the oranges....which means high chlorine levels. It's always a good double check when you are testing with DPD! If the OTO test remains colorless then it means you REALLY have 0 ppm chlorine in the pool.

[CrazyJoey]

The reason you tested 0 ppm chlorine is because the DPD test in the Taylor k-2005 will bleach out at high chlorine levels. It really only works up to about 10 ppm chlorine. After that you need to dilute the test sample with distilled water. If you read the intructions on the lid about diluting your sample with distilled water and look on the comparator tube you will see the markings for dilution. This will allow you to test your chlorine when the levels are high. If you have an OTO test kit (reagent turns yellow, usually found in the 2 way chlorien and pH testers) I betyou will find that it turns deeper then yellow into the oranges....which means high chlorine levels. It's always a good double check when you are testing with DPD! If the OTO test remains colorless then it means you REALLY have 0 ppm chlorine in the pool.

I saw that last night, and did the dilution sequence. I had to fill the tube to 1.8mL for me to get a good reading. It's hard getting a good read on the colors, especially when I have a white background like a piece of paper.