The pollen around here has been unreal too. A few weeks ago I had thought I had a mustard algae problem because it looked just like what others had taken a picture of and also called mustard algae. At first i hadn't noticed any pollen problems near my house.
But after several weeks of this problem had gone by...I had shocked at a high rate but the problem persisted. I also noticed at one point that it looked like I may be beating the problem because I didn't notice any more of the substance in the bottom of the pool. But this coincided with a rain one time (knocking down the pollen) and what I suspect being in between bloom times of the trees.
I took a sample and it was clear that the problem was pollen and not mustard algae. It wasn't until a few days after I had taken my samples that the wind was blowing while I was outside and it looked like it was raining pollen. The amount was unbelievable!
After a bit more time I also started to notice a large amount of white scale pieces in my pool. These are seed encased in a seedcaot attached to a "wing" (which is how the seed "flies" away from the tree. What I believe is happening is that the problem I have is a combination of pollen AND these seeds.
Now I vacuum my pool every two days and keep regular tabs on my chlorine levels. I also run my pump from morning to night, so it's not as if I'm neglecting my pool. But what I believe is happening (and I may be wrong) is that the pollen and seed are getting caught in my cartridge filter (which I cannot vacuum to waste). The pollen may go through immediately or it may take some time to get pushed through the filter. The seed/wing segments I'm sure are being caught in the filter but I wonder if the "wing" section deteriorates from the pollen sized seed allowing the (now) water logged seed (and water logged pollen) to pass through the filter media.
I would suspect sand filters to act in the same way unless you vacuum to waste (which is why I asked Janet what type of filter she had).
just a few thoughts...
dan
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