For any kind of infectious agent in the water, the answer is:......MORE CHLORINE!!!!
If you have such an agent, and your CYA is 230, you'd best use Poconos's plastic sheet method to do a 100% replacement of your water, then shock the heck out of the new water to kill anything and everything hanging around on the plumbing and fitting.
Nitrates, phosphates, etc: I take a dim view of addressing those before the KISS method. If you have something growing in your water, you need CHLORINE, lots and lots of CHLORINE!
With a CYA of 230, I wouldn't pay any attention to nitrates and phosphates. Your problem is as unsubtle as dump-truck--your CYA is way, Way, WAY too high and you must get it down. Ben's discussion of high CYA is for 100ppm, to 200ppm (a theoretical max) and you are beyond THAT!
You must lower your CYA. Period.
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