Softener Injector Assembly with Check Ball MF40 you will need to replace

you will need to replace the powerhead or consult the factory to discuss other options

backwashing filter

Compatible with the following control valves:

Replacement snap ring for 8x40" cartridge tank filters

CSI Signature II Legacy View Circuit Board (pre-mounted in faceplate for quicker installation) with encoder

Softener Injector Assembly with Check Ball MF40 you will need to replaceInjectory Assy for CSI Signature 3, or WaterSoft Isobar 3 softeners: #1 White Injector: 24,000 & 32,000 grain softeners #2 Blue Injector: 48,000 & 64,000 grain softeners #3 Yellow Injector: 96,000 & 128,000 grain softeners If your injector assy has a check ball on it as shown, you must use this style of injector. The Signature 2 Isobar 2 style injector without the check ball will not work properly in newer systems.