What is the difference between Spa Pump wet end and dry end? Sherralyn June 22, 2018 05:58 Updated Follow The wet end moves the water through the impeller and the dry end turns the impeller. For parts, visit spastore. Related articles What information do I need when replacing my pump? What does the Error 3 message on my Spanet SV series touch pad mean? What is the difference between a Circulation and Boost Pump? Can I use nappy cleaner to clean my filters? Comments 0 comments Article is closed for comments.