Before doing that, follow this procedure:
Remove the hose exiting the pump with the unit off. Have someone turn on the unit. Right when the water starts blowing through hard, jam the hose back on.
More often than not I see people thinking their unit is clogged when in fact, it is a vapor lock. I am not saying that you are not clogged up... but we RARELY see that if ever. Typically it is a vapor lock. Regardless, following what I said should allow the water to push back through. if not, it has cost you nothing but a few minutes. It is important to take the hose all the way off though to get a good hard flow. Try that first.
Mainsheet Technical Editor, C400