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After learning that the spots around my rock waterfall may be black algae, I completed a SLAM. I believe I passed the OCLT successfully, so I returned the water to normal chlorine levels. But I'm not sure if I was able to treat it all. Here are a couple of pictures from around the rocks after...

First I want to say thanks to the great folks that contribute to this site! Taking ownership of my pool has been a great decision and I couldn't have done it without all of you! I've had to do a couple of absorbic acid treatments in the last year due to metal staining showing up on the bottom...

Hello. I'm new to the site and to the TFP method and I'm hoping someone can let me know if I'm on the right track to treating what I think is mustard algae. I recently fired my pool maintenance company for a number of reasons, including the persistent algae on the southern, shady walls of our...