This will be useful someday i never knew the pepsi method, will have to try that out if and when my drain gets clogged in the future! We have received your files we will contact you shortly. Making an appointment is easy! For use with tough clogs or in floor drains, simply double labeled dosage instructions. Wds can carry out a wide range of cctv surveys to suit your needs; from a "look see" inspection, to a full condition report we use the.