While at the GIE I visited the Hudson booth to ask if they had any inline screens for the pump up sprayers. Mine often seem to clog because of debris. Hudson sells a wand that has a screen about 2 inches long built in. I think this should solve my plugging problems. I could go to backpacks, but I would need about 8 or nine total. I use backpacks for the larger volume chemicals, and the cannister sprayers for those chemicals that I just spot spray infrequently. Hope this spray wand will help others.