My fiberglass pool had some stains when we opened it. I tested the water for CC to determine if it was organic or metal. With a CC of 0, I figured it was metal. I used Stain Free and the next day nearly all the staining was gone. I kept my water balanced for the next week or so, and then the staining returned. Again, I got 0 CC so I figured the metal was back. Well, before I could get some Stain Free, the pool started getting greener and greener. All my testing indicated 0 CC. I applied the Stain Free, and it did virtually nothing. So, despite my test results, I must have algae.
I have started the SLAM process. But, I don't understand why I did not get any CC level. I do get FC levels and have compared its results to the test included in the Basic Taylor kit. I use the TF-100 Testkit. I replenished my R-871, R-870 and R-0003 reagents last summer. Why doesn't the algae cause me to have a CC level?