Your cya is good. Your chlorine level is fine - you can keep it closer to 4 - here is the best guess chart:


Stabilizer . . . . . . Min. FC . . . . Max FC . . . 'Shock' FC
=> 0 ppm . . . . . . . 1 ppm . . . . . 3 ppm . . . . 10 ppm
=> 10 - 20 ppm . . . . 2 ppm . . . . . 5 ppm . . . . 12 ppm
=> 30 - 50 ppm . . . . 3 ppm . . . . . 6 ppm . . . . 15 ppm
=> 60 - 90 ppm . . . . 5 ppm . . . . . 10 ppm . . .. 20 ppm
=> 100 - 200 ppm . . . 8 ppm . . . . . 15 ppm . . .. 25 ppm

As you can see with a cya of around 30 you can keep it on the low side around 3-4. I would run my ph around 7.2 to 7.4. You may want to add some more metal out, if the stains are coming back you don't have the metal in the water staying in solution. - and run your pump 24/7 for a couple of more days. Don't shock the pool for at least 2 weeks, I only shock if I have combined chlorine. Remember the pucks will add cya, and also bring down your ph because they are acidic, so I would keep the puck in the skimmer for a couple of days, if you have either a DE or sand filter.