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Just an update: balancing and adding bleach is clearing up the stain. Thank you all!

Thanks. I'll try it. I just got my CYA under control at the end of the last season by draining half the pool and switching over to the TFP method, so I'm loathe to put any sticks or tabs in the pool. Here's a pic of the quite large stain. I'm afraid quite a few will be required. Hopefully my...

I have dichlor sticks I don't use anymore. But if trichlor is more effective I can get some.

Uncovered our pool to vacuum yesterday, which I have to do several times during the winter due to all the worms and fir needles we get (even tho it's covered!) After cleaning up the usual big clump of worms in the bottom there was a large black spot about 8"x 5" irregular in shape, right where...