Well it all depends, they will tell you one price when they come to test your water and set up installation, then after the installation when the seller comes out to test your water again to show you that it is clean, they tell you another price. Good luck if you choose to go with Nuvia.
They didn't change the price on me from the one identified at the testing phase. My system cost 3500 but I ordered 2 on the same day. 1 for me and 1 for my friend. There's also a deal with the pure and gentle company don't forget to ask about that.
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