We have a basement bathroom. If you flush the stool once, with or without a "load", it seems to flush normal. If you flush it again, soon after, it doesn't flush well. It doesn't swirl. If you wait a couple of minutes it will flush again. It will swirl. If someone puts a "very heavy load" in the stool it will back up and take several flushes over a period of hours in order to clear it out. A normal load won't do that, but it will slow down and not swirl for several minutes afterwards. I'm thinking of either trying to clean the line myself with a rented auger, or hiring someone to do it. I've seen people augering lines with the toilet in place. Would this work? Or should I have a professional come in and remove the stool and have the line augered with a high powered device? It has been in this condition for at least a year. Thanks in advance.