If you are looking for an alternative to an IntelliChlor, the CircuPool SJ20 can easily replace an IC20 using its SJ Adapter Kit, which allows it to connect to the existing Pentair unions. The power, features, and warranty compare very well.
https://discountsaltpool.com/CircuPool-SJ-20-Salt-Chlorine-Generator_p_148.html
https://discountsaltpool.com/CircuPool-SJ--HaywardPentair-Cell-Adapter-Kit-_p_184.html