Follow directions on bottle and dont worry about it but do empty the cup. some turn off the skimmer for a couple days, myself, i prefer to add more often with much smaller amounts. cut your dose in half and add 2 times instead of one over the same period, and then down to 1/4 and add 4 times over the same period, or , if still not satisfied consider a dosing unit to automatically dose preset amounts all week long etc. hope this helps. I would not be too concerned about the skimmers reaction to the additives it is just doing what it suppose to do and the additive messes it up for a bit.
