Our house has two full bathrooms. The toilet in the hallway bathroom has started to drain slowly after it has been flushed. The use of a plunger will encourage the water to finally drain but still not at the normal rate as it would if there was a legitimate clog. The tank will refill without any hesitation. I opened the drain line in the back yard that drains to the sewer and used an attachment on the garden hose that has a rubber ball that expands to close up the line when the water pressure through the hose is at maximum strength. After running the water awhile through that attachment there does not appear to be any clog in the drain line. The toilet in our master bathroom flushes without any problem. What other suggestions do you have?