Well after about 4 years of loyal and reliable service I finally had to replace my filter cartridges. I am kinda happy and sad about them. the old ones missed a lot of stuff and in doing so I only had to clean them once a month if that. made for an easy schedule. but now its almost every week. really throwing my relaxed scheduling off. all in all I'm happy cause the new filters catch more but bummed at how quickly they clog.