Well, after running the filter for over a week and shocking a couple of times my pool is still devouring chlorine. The water looks very clear. There is a stain in the middle of the shallow end which looks like dirt. Other than that, the pool looks very clean.

On Saturday, I put enough bleach in to get me to 5 ppm, but it was pretty much gone the next day. So I put in 3 gallons of 10% which would get me to 15 ppm. That was down to about 2 ppm this afternoon. So I put in 4 more gallons of 10%, which should get me just over 20 ppm. If the pattern continues, this will be gone in a couple of days.

I also lowered the PH to offset the effect of the bleach and to get down to a PH level where the chrloine will be more effective. I brushed the pool as well (for the 5th or 6th time in the last week). I'm going to let the pump run all night.

Here are my test results from this afternoon before adding the chlorine:

TC - 2ppm (I didn't test FC today)
pH - 7.6
T/A - 120
CYA - 50
CH - 270

mwsmith2, one interesting thing to note about the CYA. When I closed the pool in December I had a CYA of 100 (thanks to my friends at the pool store ). I drained the pool about 15 inches at closing, which was replaced with rain water. Now I have a CYA of 50. I read on the old forum that some people have a drop in CYA over the winter and that organic material or bacteria might be the reason for this. I wonder if this is more proof that I have the bacteria problem you described.

Thanks to all for the help. My plan at this point is to go into standard algae mode: 20ppm/filter 24x7/brush daily. Am I on the right track?

Thanks,
Lenny