It can. Depends on your pH rise, TA of your fill water, etc.
I see you have an autocover. If left closed, your pH will not rise. Or if it does, very slowly.
i do plan on running the pump probably not for as many hours as I do now. the ph does raise slowly with the pool cover on but I never checked if it can withstand for 3 weeks (probably not based on my memory)
Update: I used pucks while I was away for 3 weeks. The PH just raised by 0.2. I had it lowered to 7.2 before i left to give a better buffer if it raises. I had put in 2 pucks ( from costco) and it was completely used up by the time I got back.
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