Do you have stabilizer in the skimmer or trichlor pucks in the skimmer? If it is pucks, they are very acidic and will drive the pH down. To raise pH, you can use some 20 Mule Team Borax (laundry aisle at Walmart). Can't really recommend an amount without knowing how big your pool is. Please fill in your pool's information in our pool chart as it will make it easier for someone here to help you.
Pool Chart Entry FormAlso, tell us exactly what all you have added to your water -- meaning ingredients and not just "shock."
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