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How low is your Ph?
3oz of sodium carbonate will raise 5000g from a Ph of 7.2 to 7.4 so if you are in that range I'd add 1/2oz wait an hour and retest then add another 1/2oz if needed
You should only shock when you need to severely raise chlorine levels.
Changing the filter is solely dependent on how fast it dirties, Check it monthly
I'm guessing his eyes are red from the chlorine levels not the Ph
Does this address your concerns to your satisfaction?