If you're comparison shopping between Culligan and Puronics in the Charleston area, here's what I'll tell you as a Puronics dealer. Both brands make legitimate whole-home water conditioning equipment. Both have been in the market for decades. The differences are in the install model, the NSF certification scope, and the pricing transparency.
Installation model
Culligan in the Charleston area operates through a franchise (Low Country Water Treatment). They use a sales-team-then-installer model. I run Pristine Water Networks as an owner-operator. I do the test, the consultation, and the install myself.
NSF certification scope
Culligan whole-home softeners are typically NSF/ANSI 44 certified for cation exchange (hardness reduction). The Puronics Hydronex iGen C whole-home conditioner is WQA-tested and not currently NSF listed for contaminant reduction as of April 2026. Different standards, different claims.
For point-of-use, the Puronics Pur-Alkaline 6-stage reverse-osmosis system is the unit Pristine installs at the kitchen tap. The exact certification scope for the recommended model is provided in writing before install, verify any listing at info.nsf.org.
Pricing
Culligan's website explains why they don't publish prices. I publish $7,999 installed because I think you should have a number before the appointment.
My honest advice
Get both quotes. Compare the warranty terms, the NSF scope for each specific model they're recommending, and whether the person quoting is the person installing. Call (843) 302-5720 for a free test and a written quote you can compare.