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Matt, as you can see, I originally followed the standard method for treating mustard algae. I need to know why it stopped working to prevent a similar problem in the future. Here is the link to Chem Geek and others discussing ammonia and bromine (and other alternatives) for difficult mustard...

Yeah, s1njin - that's what I'm thinking. It's been a year and a hundred gallons of chlorine since I used the bromine, so my understanding is that it should no longer be a problem. One quote from Chem Geek: "Eventually, over weeks (or longer), the bromine dissipates. . ."

Duraleigh, here is the main link: High CYA Levels, Shocking, Yellow/Mustard Algae You said the fix is the drain the pool, but you said that was in order to get rid of the copper; that is a separate issue. I still want to know why nothing is working; why I am able to put 20 gallons of 6% and 4...

I feel like no one actually read my post. I have a Taylor K2006 test kit. I have followed the SLAM instructions. I am measuring CYA and overnight chlorine loss. As a side note, the information on bromine and ammonia came from TFP threads that included Chem Geek. - - - Updated - - - Dom...

Taylor K2006. Water replacement is an option - the only option, really - but I'd like to understand why this is happening.

First, I am a long time user. I started using the TFP method about 5 years ago, and it helped me get some impossible pools under control (I maintain three pools because I have rental houses). For a few years, all was well. I used my Taylor kit to measure my CYA, alkalinity, PH, etc., and...

About a month ago, I brought my pool problems to the forum poolspaforum.com. You see, my pool had gotten out of control. After a couple of years of mediocre water quality and spending about $100 a month on chemicals and periodically dishing out for expensive professional pool service, I...