[{"data":1,"prerenderedAt":214},["ShallowReactive",2],{"\u002Fwater-filters\u002Fcomparisons":3,"type-articles-\u002Fwater-filters\u002Fcomparisons":174,"related-\u002Fwater-filters\u002Fcomparisons":179},{"id":4,"title":5,"body":6,"date":164,"description":165,"extension":166,"meta":167,"navigation":168,"path":169,"seo":170,"silo":171,"stem":172,"__hash__":173},"content\u002Fwater-filters\u002Fcomparisons\u002Findex.md","Water Filter Comparisons: My Method and My Head-to-Heads",{"type":7,"value":8,"toc":157},"minimark",[9,13,24,43,61,71,77,85,100,105,132,145,153],[10,11,12],"p",{},"Comparing water filters on their product pages runs into one recurring trap: everybody advertises \"removes chlorine\" and \"improves taste\", which is about as discriminating as praising a car for having wheels. Any gram of activated carbon removes chlorine. The real differences hide in numbers the listings carefully avoid.",[14,15,17,23],"h2",{"id":16},"what-i-look-at-in-this-order",[18,19],"icon",{"className":20,"name":22},[21],"size-6","solar:checklist-minimalistic-bold-duotone"," What I look at, in this order",[10,25,26,30,31,34,35,38,39,42],{},[27,28,29],"strong",{},"Cost per gallon filtered."," It is the only figure that lets you compare a pitcher, a faucet mount and an under-sink unit on the same basis. A $7 pitcher cartridge good for 40 gallons works out at ",[27,32,33],{},"17 cents a gallon","; a $20 faucet cartridge good for 100 gallons lands around ",[27,36,37],{},"20 cents","; an under-sink block rated for 1,000 gallons drops under ",[27,40,41],{},"10 cents",". The purchase price of the housing is almost incidental beside that.",[10,44,45,48,49,52,53,56,57,60],{},[27,46,47],{},"What it is certified for, and under which standard."," This is the criterion that actually separates products. ",[27,50,51],{},"NSF\u002FANSI 42"," is aesthetic: chlorine, taste, odor. ",[27,54,55],{},"NSF\u002FANSI 53"," is health: lead, cysts, certain VOCs. ",[27,58,59],{},"NSF\u002FANSI 58"," is reverse osmosis. A filter certified 42 only is not certified for lead, no matter what the packaging photograph suggests. When no standard is named at all, assume taste and nothing else.",[10,62,63,66,67,70],{},[27,64,65],{},"Real flow rate."," A filter that takes thirty seconds to fill a glass ends up bypassed: the lever goes to \"unfiltered\" and never comes back. Above about ",[27,68,69],{},"0.5 gpm"," daily use stays comfortable; the better faucet mounts do more.",[10,72,73,76],{},[27,74,75],{},"Whether it fits your faucet."," The number one reason these get returned. Pull-down sprayers and flat spouts refuse most screw-on filters — check before buying, not after.",[14,78,80,84],{"id":79},"one-market-three-logics",[18,81],{"className":82,"name":83},[21],"solar:shop-bold-duotone"," One market, three logics",[10,86,87,88,91,92,95,96,99],{},"The ",[27,89,90],{},"legacy brands"," like Brita and PUR sell simplicity and cartridges available in every supermarket in the country. The ",[27,93,94],{},"under-sink specialists"," sell discretion and long-life cartridges, at the cost of an installation. And the ",[27,97,98],{},"pitcher"," sells having nothing to install at all.",[101,102],"comparison-table",{"ids":103,"type":104},"pur-plus-faucet,waterdrop-15ub,brita-everyday-pitcher","filter",[10,106,107,108,111,112,115,116,121,122,126,127,131],{},"That table shows the cost-per-gallon point better than any paragraph: the \"Filter life\" column runs from ",[27,109,110],{},"2 months"," for the pitcher to ",[27,113,114],{},"12 months"," for the under-sink. Divide cartridge price by capacity and the ranking inverts completely compared with purchase price. My commented selection is on ",[117,118,120],"a",{"href":119},"\u002Fwater-filters","the section's front page",", the under-sink format has its own page in ",[117,123,125],{"href":124},"\u002Fwater-filters\u002Fcomparisons\u002Funder-sink-water-filters","which under-sink water filter to choose",", and the full match between approaches — up to reverse osmosis — is settled in ",[117,128,130],{"href":129},"\u002Freverse-osmosis-systems\u002Fguides\u002Freverse-osmosis-vs-pitcher-filter","reverse osmosis vs pitcher filter",".",[10,133,134,135,139,140,144],{},"One reminder before comparing anything: none of these machines treats hardness. If that is your subject, ",[117,136,138],{"href":137},"\u002Fwater-quality","check your hardness"," and read the ",[117,141,143],{"href":142},"\u002Fwater-softeners","softener section"," instead.",[14,146,148,152],{"id":147},"frequently-asked-questions",[18,149],{"className":150,"name":151},[21],"solar:question-circle-bold-duotone"," Frequently asked questions",[154,155],"faq",{":items":156},"[{\"q\":\"How do I compare two water filters objectively?\",\"a\":\"Reduce everything to cost per gallon filtered (cartridge price divided by rated capacity) and to what the filter is certified for, under which NSF\u002FANSI standard. Those two settle it better than any marketing claim.\"},{\"q\":\"Does a more expensive filter filter better?\",\"a\":\"Not necessarily. Price often reflects the brand and its distribution more than the technology. What is worth paying more for is an NSF\u002FANSI 53 certification, which is a tested health claim rather than a taste claim.\"},{\"q\":\"What is the minimum flow rate for a faucet filter?\",\"a\":\"Aim for at least 0.5 gpm. Below that, filling a pot becomes a test of patience and the filter ends up bypassed permanently, which is the same as not having one.\"}]",{"title":158,"searchDepth":159,"depth":159,"links":160},"",2,[161,162,163],{"id":16,"depth":159,"text":23},{"id":79,"depth":159,"text":84},{"id":147,"depth":159,"text":152},"2026-08-03","How I compare water filters: cost per gallon, filtration grade, real flow rate and certification — beyond 'removes chlorine, improves taste'.","md",{},true,"\u002Fwater-filters\u002Fcomparisons",{"title":5,"description":165},"water-filters","water-filters\u002Fcomparisons\u002Findex","JsyUuU5Gm3XJx84SAaqWm21MmDbZIpFAipiDqeiVD2k",[175],{"path":124,"title":176,"description":177,"date":178},"Which Under-Sink Water Filter to Choose in 2026","Under-sink filters: real cartridge capacity, cost per gallon, installation, and the difference with reverse osmosis. The models I would pick, and for what.","2026-08-04",{"overview":180,"articles":183},{"path":119,"title":181,"description":182},"Water Filters: Which One to Choose in 2026","Pitcher, faucet mount or under-sink: which water filter to pick to improve your tap water, what it costs, and what it really does to the taste.",[184,185,186,190,194,198,202,206,210],{"path":169,"title":5,"description":165,"date":164},{"path":124,"title":176,"description":177,"date":178},{"path":187,"title":188,"description":189,"date":178},"\u002Fwater-filters\u002Fguides\u002Fchlorine-taste-tap-water","Chlorine Taste in Tap Water: Where It Comes From, How to Get Rid of It","Why your tap water tastes like a swimming pool, what that says about its quality, and the fixes that actually work — from a pitcher to an under-sink filter.",{"path":191,"title":192,"description":193,"date":164},"\u002Fwater-filters\u002Fguides","Water Filters: The 3 Questions to Settle Before Buying","Diagnosis, format, upkeep: my water filter buying guides, in the order the questions come up before you reach for a card.",{"path":195,"title":196,"description":197,"date":178},"\u002Fwater-filters\u002Freviews\u002Fbrita-faucet-filter-review","PUR PLUS Faucet Filter Review: What It Really Does","A review of the PUR PLUS faucet mount: what it actually filters, its real cost per gallon, the faucet compatibility question, and the alternatives.",{"path":199,"title":200,"description":201,"date":164},"\u002Fwater-filters\u002Freviews","Water Filter Reviews: How I Judge Them","How I build my water filter reviews: the verifiable criteria, the traps in online reviews, and what only shows up after months of use.",{"path":203,"title":204,"description":205,"date":164},"\u002Fwater-filters\u002Ftools","Water Filter Tools: Diagnose Before You Buy","My tools for sizing up your water before spending a dollar: your utility's report, testing hardness yourself, and the cost-per-gallon calculation that settles every comparison.",{"path":207,"title":208,"description":209,"date":178},"\u002Fwater-filters\u002Ftools\u002Ftest-water-hardness-at-home","How to Test Your Water Hardness at Home","Test strips, titration kits or a TDS meter: the three ways to measure water hardness at home, how accurate each really is, and the ppm-versus-grains trap.",{"path":211,"title":212,"description":213,"date":164},"\u002Fwater-filters\u002Ftools\u002Fwater-hardness-by-city","Water Hardness by City: Why Your Report Probably Doesn't List It","Finding your water hardness in grains per gallon: what utilities publish and what they leave out, why most reports skip hardness, and how to get the number anyway.",1787678118367]