Sorry I haven't replied sooner but am 45 and 7 months pregnant. Have not been feeling well. Anyway, my pool is a slight color away from being clear. I tested my hydrant water which is where we fill from. The PH is 7.2, alkalinity is 375, and calcium is 310. I just received a test bottle from our health department to test our iron, manganese, and copper. I will have those in a couple of weeks. However, I expect it to come back high in iron and possibly manganese too. I know the copper isn't high because I've tested that and besides our house is old enough they used cost pipes not copper back then. I have a question. I'm pretty sure I killed any green algae there may have been. However, every morning when I go out and look there is a dark green or brown sticky substance along all the seems. Would that be black or mustard algae? How do I get rid of it because heavy shock, brushing, and vacuuming does nothing, it just comes back.