I recently purchased a Viking Legend spa. Piece of plastic (about the size of a golf pencil) accidentally got sucked into hot tub pipe while filter was removed for cleaning. I could hear it rattling in the pipes, and I turned off the power to the tub to avoid further problems. I've read on websites to open up the union valve, but do I need to close the little knobs on the Pvc pipe first? Also will water start spilling in the cabinet? Do I need to empty the tub? And lastly what is the best tool to open the union? I'm nervous about causing more than problems.