{"product_id":"cuzn-uc-100-under-sink-water-filter","title":"CuZn UC-100 Under-Sink Water Filter: Stainless, Made in USA, No Water Waste","description":"\u003ch2 class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhy we choose CuZn UC-100\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe CuZn UC-100 is a well-built, affordable under-sink filter that does its core job without electricity, without wasting a drop of water, and without stripping the minerals from your water. It uses a combination of KDF and activated carbon media in a stainless-steel housing, it is made in the USA, and it connects inline to your existing cold water line so you get filtered water straight from your tap. It is a genuinely good filter at a fair price, and the honest question with it, as with any carbon filter, is what its claims are actually certified to cover, which we will be clear about.\u003c\/p\u003e\n\u003ch3 class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eHow does the CuZn UC-100 filters\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e1. Water flows under your home's normal pressure through a bed of KDF and activated carbon. \u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e2. KDF media is good at chlorine and heavy metals, while the activated carbon handles chlorine, taste, odor, and organic compounds. \u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e3. Because it filters rather than strips, beneficial minerals stay in the water, and because there is no membrane, there is no wastewater and no need for electricity or a storage tank. \u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e4. One cartridge lasts about a year, or 10,000 gallons.\u003c\/p\u003e\n\u003ch3 class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhat does the CuZn UC-100 actually reduces, and how it is verified\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThis is the part to read carefully. The UC-100 is \u003cstrong\u003ecertified to NSF\/ANSI 42 and 372\u003c\/strong\u003e, which cover the reduction of chlorine, taste, and odor, and confirm the system's materials are lead-free. That certification is genuine, but it is the same point we make across this collection: it covers chlorine and materials, not the removal of PFAS or lead.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eCuZn does claim that the \u003cstrong\u003eUC-100 reduces PFAS, PFOS, and lead through its KDF and carbon media\u003c\/strong\u003e, and there is a real basis for that, since carbon can adsorb some PFAS and KDF can capture some heavy metals. But those reductions are the manufacturer's claim, supported by their own testing, not part of the NSF certification. So treat the chlorine and taste reduction as certified, and the PFAS and lead reduction as manufacturer-claimed rather than independently certified. If certified PFAS reduction is what you want from an under-sink filter, the WaterChef U9000 in our collection carries that certification and is the stronger choice; the CuZn is the more affordable option whose PFAS claim rests on the maker's own testing. For context on why PFOA and PFOS reduction is worth prioritizing, the EPA has set enforceable limits for both and a health goal of zero: \u003ca class=\"underline underline underline-offset-2 decoration-1 decoration-current\/40 hover:decoration-current focus:decoration-current\" href=\"https:\/\/www.epa.gov\/pfas\"\u003ehttps:\/\/www.epa.gov\/pfas\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3 class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eThe honest tradeoffs\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e1. Like any carbon or KDF filter, it does not reduce dissolved salts such as fluoride, nitrates, or total dissolved solids, which is reverse osmosis territory. \u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e2. Its PFAS and lead reductions are not third-party certified, as noted. \u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e3. And it installs under the sink and connects to your plumbing, which is more involved than a countertop unit, though it needs no power. \u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e4. On the positive side, the stainless housing and US manufacture are real advantages over the plastic filters common in this category.\u003c\/p\u003e","brand":"CuZn","offers":[{"title":"1-Year","offer_id":50310579224823,"sku":"B0FH11CFGB","price":69.99,"currency_code":"USD","in_stock":true},{"title":"2-Year","offer_id":50310579257591,"sku":"B0FH15SZ3Q","price":94.64,"currency_code":"USD","in_stock":true},{"title":"5-Year","offer_id":50310579290359,"sku":"B000923524","price":134.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1642\/9047\/files\/51R-XUqRHGL.jpg?v=1764327188","url":"https:\/\/thetrueshift.com\/products\/cuzn-uc-100-under-sink-water-filter","provider":"The True Shift","version":"1.0","type":"link"}