Good morning back! You can do both at the same time. I do both all the time with no problems. Just go with small additions and add them slowly to your skimmer while the pump is running, breaking up any large clumps. Then, wait a few hours to let it circulate and then retest and redose as needed until you get them where you want them. Easier to go slow and add more rather than overshoot your target and have to lower them. Hope this helps.

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