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Sometimes when you mix different brands of WW fluid together or add very hard water, the different additives may react or precipate out into solids that tend to gum up the works. You may have to clean out the bottom of your tank as well as all the hoses that feed the nozzles. Have you tried unplugging the hoses from near the pump and activating it to see if you have good pressure directly from the pump? Can you blow air through the lines? I'd suggest you start at one end of the system and work all the way though it, cleaning and testing it as you go.
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