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But I thought the OCLT test demonstrates it is not algae?? I think I will try that test a couple more times to see if things change. My plan right now is to back off the chlorine a little and alternate sweeping and vacuuming, keeping the pool free from leaves, to see if that changes anything...

Ok I cleaned all leaves out of the pool and did the OCLT test. Both last night and this AM show FC of 34 and 0 CC's. So do we think the green dust is not actually algae and I can back off the chlorine a little, the daily sweeping, and running the pump 24/7?

We have had a couple windy days and there are more leaves at bottom of pool. Will that impact the OCULT results? Would it be better to vacuum and start over with testing?

The green dust is all over the pool - every day - shade, sun, shallow end and deep end. So I assumed that it was algae. If you guys think not, maybe I can relax a bit. I will do the overnight chlorine loss test.

I also add a little DE to the skimmer - per your instructions on the site - most times after backwashing. The water is clear. The sand is probably 10 years old. I have washed it a couple times - as recently as about 6 mos ago - but I don't know that I did it well enough and a lot of leaves and...

PSI on the gauge is 15, goes up to 20 after a few days, at which point I am backwashing and rinsing and it goes back down. This pool has done well using TFP principles for over a year, through very hot weather. So I am mystified why at this temp it is doing this.

FC = 32; No CC's; TC = 32; CYA is less than 20; Alk = 200 Water temp is 42

I have that test kit and use it. I have read the ABC's of Pool Chemistry. I have been following the SLAM process for weeks with no real change. I am brushing, adding liquid chlorine, backwashing, and running filter 24/7. I just vacuumed leaves today. I will do a complete set of tests tomorrow...

Hope you guys can help. I am fighting algae in a 42 degree pool, sand filter, about 30,000 gal. I have bee using nothing but liquid chlorine for 2 yrs and did pretty well this past summer. But I backed off a little in the fall and now every day I am brushing off greenish "dust" from all sides...