Your pH is actually just fine at 7.2--with metals in the water, you need to keep the pH on the low end in order to help keep it from precipitating out and staining your pool. Total hardness is not low at 400 ppm. Actually, that's pretty high, but if it's that high in your fill water, then there's not much you'll be able to do about it except keep the pH and TA low. You do need to try to keep your chlorine in the 3-6 ppm range, and I don't think you'll be able to do that with just the pucks. Besides, the pucks are going to continue to raise your stabilizer, which in turn raises the amount of chlorine you have to keep in the pool--and high chlorine is going to be a problem with iron in the water. You'd be better off to stop using the pucks and just use bleach or liquid chlorine (same thing, different strength).

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Welcome to the forum!!

Janet