So 2 months ago I was a TFP newbie, and learned a lot (thanks to all). I had a 5 day SLAM, and my water was the clearest I have ever seen it. I figured out my pool was losing about 1-1.5 ppm per day, and I was adding 1/2 gallon of 8.25% daily. Sometimes I would add 1 gallon, every 2 days. All was great until about 2 weeks ago, when I did not add anything for about 5 days. The mustard showed up shortly after. The problem I have is that I am still passing the OCLT. In fact I am more than passing it. Yesterday, I vacuumed about 75% of the yellow off the walls to waste, until I lost so much water, that I had to switch to filter to finish vacuuming. I tested last night at 8 PM, and FC was at 5.5. I added 1 gallon of 8.25% which should have brought it to 7. I just tested now (24 hours later), and I am still at 6, and today was 96 degrees, and very sunny. So I only lost the 1 PPM, that I usually lose in a day.
So my question is how can I have mustard and still pass the OCLT? Here are my numbers:
CC: .5 or less