Remove the two screws from the top of your Bryant furnace cover. Pull forward on the cover to remove it.
Locate the condensate drain connection near the middle of the unit.
Inspect the lines for signs of leaks. Remove leaky pipe with a hacksaw if the pipe is made of PVC or unscrew the broken part. Replace the line.
Remove the drain line cap. Place the end of a shop vacuum over the open drain line. Wrap the end of the vacuum hose with a rag. Turn on the vacuum for a few seconds to clear out the line.
Pour a cup of bleach into the open drain line using a funnel. This kills all the algae in the line.