After about a year and a half, many of the nozzles for my system were no longer spraying or they were barely spraying. I took them apart and tried to clean them, but it didn’t help. After looking at the site, I found the replacement ball and springs and the replacement filters. I ordered both and for about $80, I was able to fix all 19 of my clogged nozzles. Since each pack comes with 100 parts, I have plenty of spares that should last me for another 5 years. Considering each nozzle is about $6 and the fact that I have 19 nozzles, I was able to save a ton of money by rebuilding the internals myself.