This newly designed standpipe (redesigned in Feb. 2012) is used to make a 1990-current Hot Spring spa "EverFresh®" ready. This gray colored standpipe is modified to enable it to accommodate the FreshWater Siver Ioniser. The AG+ Silver Ioniser cartridge is inserted into the top of the standpipe and is suspended within.
Replacement filter standpipe for Hot Spring Classic & Sovereign models from 1984-1990, and Tiger River models 1991-current. Uses cap with code 31389