Yes, Cy-Kick CS can be used outdoors to kill cluster flies. It is recommended that you apply the product in cracks and crevices where the pest may harbor or hibernate. Do not repeat applications more than twice a week. Treatments need to be done at least 3 days apart. The mixing ratio is 1-2 fl. oz. per gallon of water.
There should be no "side effects" from Cy Kick CS if it is used according to the instructions on the product label. Children and pets should kept out of the area while the product is being applied and until everything is fully dry.
Cy-Kick CS should be applied in temperatures below 85 and above freezing.
Yes, Cy-Kick CS can be used for ants.