New Pool Owner with Bad Water

[sjrups]

Definitely iron in the water. I had Nelson labs test for iron only. Confirmed my suspicions. 12.4 ppm. They said that .3 ppm in drinking water causes stains. What to do next? Shock or try to clean before shocking? Thanks again to everyone for being so helpful. See copied lab report below:

Sample Description: POOL/STREAM WATER - Temp. rec'd: 19 oC
Sample Date: 8/05/10
Sample Time: 6:00
__________________________________________________ ______________________________________________
DATE TIME TEST TEST
PARAMETERS RESULTS UNITS ANALYZED ANALYZED METHOD ANALYST
__________________________________________________ ______________________________________________
Iron 12.4 mg/l 8/05/10 12:11 200.7 CD


mg/l = ppm