What is the difference between Spa Pump wet end and dry end? Sherralyn Hawkins August 21, 2017 22:59 Follow The wet end moves the water through the impeller and the dry end turns the propeller. For parts, visit spastore. Related articles What does the Error 3 message on my Spanet SV series touch pad mean? What information do I need when replacing my pump? Comments 0 comments Article is closed for comments.