Newbie with ?'s (mustard algae) (Deb)

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This is exactly the problem I'm having as well. (I'm not far from OK either)
I just ordered my test kit and my wife is heading out to pick up some extra bleach. I have fought mustard algae for the last couple of years.
I use 3" tablets, and if I understand what I've read, that could be part of my problem? I always have low ph and high total alky. I'm so tired of talking to young kids at the pool stores, who just don't know the answers.
I've put so much algaecide in my pool I'm afraid to swim and the algea seems to like it. Last year I used the Banish 2 times and the algae keeps coming back. I just used a quart of Leslie's Copper Algae stuff, let it sit for 2 days, vaccumed to waste, and this morning it looks just like before. At this point I'm ready to try anything.