I have been mixing my own liquid fert for a few years now and somehow no matter what product I use, there is always some filler crap clogging up my chemlawn gun. I always keep my filters clean. In fact I doubled up the mesh in the filter to make finer filters. Still got the crud making the fly away streams. So, I found a use for my daughters ripped tights. (Nylons for those of you who dont have kids) I just cut little squares of the material and screw it on between the gun and the nozzle. No more clogged nozzles! Just remember to calibrate with the nylon in place. Works for me. Have a great year.