Louis from Maspeth Ny writes
InVade Bio Drain should be applied to drains at night when not use so the gel has time to work it’s way down the drain for several hours. Additional rinsing or rinsing with hot water is not needed. Normal use the next day is fine. This process should be repeated for 7 consectutive nights for active insect activity and then once a week for maintenance.
Answer last updated on: 11/05/2021