I'm a first year pool owner, who just went through the process of converting from baquacil to chlorine. Things have been going great until recently some brown stuff started showing up on the bottom of the pool. I thought it was just dirt, vacuumed up, but then kept returning.

(I'll admit I got a little lax with the bleach )

And then, about 2 weeks ago I walked out and had spots of it all over the bottom of my pool and a thin layer of yellowish colored film. I'm assuming this is mustard algae. I shocked the pool to 15 and have been putting it up to 15 every night before bed and brushing every night for the last week.

Finally I decided to try some 60% poly. Nothing I've done has worked thus far. I just finished brushing, redosing and testing the pool again.

Above Ground Pool 12,000 gallons

TC = 15
FC = 15
PH = 7.5
CA = 180
CYA = 30
TA = 130

If someone could walk me through what I need to do I'd be really greatful. This is my first time dealing with algae.