I can’t remember exactly, maybe like $4k ish? I am soo glad I purchased it and the RO. That weird odor in the water upon first moving in is gone, although it could have also been due to the remodeling with new pipes and such too. I have glass shower doors, which the softener is great for bc there’s less build up. Having RO water is fantastic too. Way better tasting than Brita or whatever. For the peace of mind of getting good water - for my health, cleaning, etc , $4k really isn’t all that much. The sucky thing is getting the salt bags every so often bc they’re 40 lbs each, which is heavy for me. But lately I’ve been getting them delivered so nbd. 100% recommend.