Pool brown after opening

Hard to tell what could be causing the brown without some more info. It could be an off-color algae or could be something related to metals in the water. It would be best to post a full set of test results from your TF-100 or Taylor K-2006 test kit.
 
Thanks for the reply - so here's what i'm getting:

PH 7.2
FC: 0
TA: 80
CYA: <10

So I'm definitely not balanced. I even checked to make sure my chemicals are OK, and get more color on the quick chlorine test if I use township water from the faucet.

My fear is that this is iron. I noticed that one of the metal railings (where my SWG was hanging) has some rust around it.
 
Lots of chlorine. He also kept a close eye on pH although tannic acid isn't too acidic. He just did some aeration while treating with the chlorine. The leaves on his mesh cover acted like a huge tea bag and the water was a clear, dark-brown mess.
 
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