While there's no substitute knowledge and testing, 1/4 cup of ultra bleach (8.25%) should raise the chlorine level to roughly 5ppm. But get yourself a simple OTO/pH test kit and test the water everyday, to make sure chlorine level stays up. Without other chemicals, testing your chlorine level and pH everyday at least once is critical. Most OTOs go only to 3, so if it's more yellow than the 3 level (ignore the bromine side) it should be fine. But if it's orange, it's too high and you'll want to let it wait and come down.

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