<b> Green Gobbler FRUIT FLY GOODBYE </b> is a thick gel that clings to pipes and drains to rid them of drain fly infestations. It eliminates annoying and unsanitary drain flies with Citronella, a natural fly killer. <br> <br> <b> DIRECTIONS FOR USE: </b>For best results, apply product at time of lowest drain use, typically at the end of the day. Initially add 8 oz to each drain. Try to coat the surface areas inside the drain pipe. Repeat daily as necessary until desired results are achieved. Then apply 4 to 8 oz per week for maintenance.