I havea question regarding cleaning and maintaining (somewhat) long pipe runs for condensate drains in walk-in coolers. Yesterday I was cleaning coils at my market and noticed the water I was spraying on the coils was draining slowly from the pan.There were a couple clean outs installed in the condensate drain and I removed the plugs and flushed with hot water through a garden hose...but I don't think I got it all. The algae had really reduced the diameter of the pipe. I've heard of drain "suckers" etc., but am dubious as to how well they work in clearing this type of accumulated slime out. I was thinking some type of chemical treatment....enzymes, etc.?