{"id":64,"date":"2026-10-03T11:31:17","date_gmt":"2026-10-03T03:31:17","guid":{"rendered":"https:\/\/www.gaodonghe.cn\/?page_id=64"},"modified":"2026-10-15T20:25:32","modified_gmt":"2026-10-15T12:25:32","slug":"home","status":"publish","type":"page","link":"https:\/\/www.gaodonghe.cn\/","title":{"rendered":"Home"},"content":{"rendered":"\n<style id=\"crc-cards-css\">\n.crc-cards>.wp-block-column{display:flex;flex-direction:column;}\n.crc-cards>.wp-block-column>.wp-block-buttons{margin-top:auto;}\n<\/style>\n\n\n\n<div class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-container-core-group-is-layout-6650c949 wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--60);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--60);padding-left:var(--wp--preset--spacing--40)\">\n\n<h1 class=\"wp-block-heading has-text-align-center\">Whole House &amp; Under-Sink Water Filters<\/h1>\n\n\n\n<p class=\"has-large-font-size has-text-align-center wp-block-paragraph\">My name is Donghe Gao. I am an engineer with 11 years of experience in water and electrical work. Our factory directly supplies two kinds of equipment: whole house water filter systems, and under-sink ultrafiltration water filters &#8212; from stainless steel machining to filter R&amp;D, production and assembly testing, every step is completed in our own factory. Before shipping, every unit goes through 100% inspection.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin-top:var(--wp--preset--spacing--30);margin-bottom:var(--wp--preset--spacing--30)\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"1920\" src=\"https:\/\/www.gaodonghe.cn\/wp-content\/uploads\/2026\/10\/donghe-gao-portrait.jpg\" alt=\"Donghe Gao, water treatment quality engineer\" class=\"wp-image-202\" srcset=\"https:\/\/www.gaodonghe.cn\/wp-content\/uploads\/2026\/10\/donghe-gao-portrait.jpg 1440w, https:\/\/www.gaodonghe.cn\/wp-content\/uploads\/2026\/10\/donghe-gao-portrait-225x300.jpg 225w, https:\/\/www.gaodonghe.cn\/wp-content\/uploads\/2026\/10\/donghe-gao-portrait-768x1024.jpg 768w, https:\/\/www.gaodonghe.cn\/wp-content\/uploads\/2026\/10\/donghe-gao-portrait-1152x1536.jpg 1152w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-0aa01211 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.gaodonghe.cn\/?page_id=58\">See the products<\/a><\/div>\n\n<div class=\"wp-block-button is-style-outline is-style-outline--1\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.gaodonghe.cn\/?page_id=61\">Read the buying guides<\/a><\/div>\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-base-2-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-710b95c3 wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--50);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--40)\">\n\n<h2 class=\"wp-block-heading has-text-align-center\">Three things I take responsibility for<\/h2>\n\n\n\n<div class=\"wp-block-columns is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-6c0c7bf9 wp-block-columns-is-layout-flex\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:76px\">\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(1.453rem, 1.453rem + ((1vw - 0.2rem) * 1.578), 2.4rem);line-height:1;font-weight:300\">01<\/p>\n<\/div>\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Choosing the right system<\/h3>\n\n\n<p class=\"wp-block-paragraph\">We look at the water quality in your home and advise which whole house water filter system or under sink water filter fits it \u2014 hard water, high TDS, well water, municipal tap water, sediment, rust, water for daily use or water for drinking. We start from your situation, not from our product list.<\/p>\n<\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-contrast-3-color has-background has-contrast-3-background-color has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<div class=\"wp-block-columns is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-6c0c7bf9 wp-block-columns-is-layout-flex\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:76px\">\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(1.453rem, 1.453rem + ((1vw - 0.2rem) * 1.578), 2.4rem);line-height:1;font-weight:300\">02<\/p>\n<\/div>\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Product quality<\/h3>\n\n\n<p class=\"wp-block-paragraph\">We are the source factory, with full quality control under one roof: material selection, machining and production, and final assembly all happen inside our factory. A complete quality management system means every unit passes 100% inspection before it leaves, and finished products meet the relevant testing requirements \u2014 certificates are available on request, just ask me.<\/p>\n<\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-contrast-3-color has-background has-contrast-3-background-color has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<div class=\"wp-block-columns is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-6c0c7bf9 wp-block-columns-is-layout-flex\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:76px\">\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(1.453rem, 1.453rem + ((1vw - 0.2rem) * 1.578), 2.4rem);line-height:1;font-weight:300\">03<\/p>\n<\/div>\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">After-sales and warranty<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Because we put heavy resources into materials and R&amp;D, our products last longer than most peers: the stainless steel housing stays rust-free and leak-free for 10 years, and is warranted for 10 years. The cartridges are designed for a 5-year life under ideal conditions &#8212; real-world water differs from home to home, so we warranty them for 3 years under normal maintenance.<\/p>\n<\/div>\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-container-core-group-is-layout-710b95c3 wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--50);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--40)\">\n\n<h2 class=\"wp-block-heading has-text-align-center\">Two product lines<\/h2>\n\n\n\n<div class=\"wp-block-columns crc-cards is-layout-flex wp-container-core-columns-is-layout-3a88641f wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Whole-house sediment pre-filter<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Filtering yellow, muddy water and turbidity is its strength &#8212; and when the element clogs, a wash restores the flow substantially. The housing is 316L stainless steel for better corrosion resistance, tested through more than 100,000 water-hammer cycles. Inside is a 0.1 &micro;m PVDF ultrafiltration membrane installed at the point of entry, easily handling the sediment, rust, suspended solids, parasite eggs and turbidity that wells, surface water and old pipe networks deliver &#8212; protecting the water for the whole house. If your water comes from a well or a river, start with the <a href=\"https:\/\/www.gaodonghe.cn\/?page_id=93\">well water filtration guide<\/a>.<\/p>\n\n\n<p class=\"wp-block-paragraph\">It is backwashable: when the membrane clogs in daily use, a rinse restores most of the flow, so the cartridge keeps working for years instead of being replaced frequently &#8212; and besides turbidity it screens out some bacteria as well.<\/p>\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-font-size has-small-font-size\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.gaodonghe.cn\/?page_id=93\">More on the whole-house pre-filter<\/a><\/div>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Under-sink water filter<\/h3>\n\n\n<p class=\"wp-block-paragraph\">No waste water, no electricity for filtration. A four-stage composite cartridge: a pleated pre-filter and PP cotton take out the large particles, activated carbon fiber adsorbs most of the residual chlorine and improves taste, and at the core is a 0.01 &micro;m PVC hollow-fiber membrane that helps reduce the remaining chlorine while filtering out colloids, bacteria and some viruses &#8212; leaving the dissolved minerals in your water where they are. 8&ndash;10 L\/min at normal household pressure. The right answer when the water is already safe, but you are not sure about the last stretch of pipe into your building. See the full <a href=\"https:\/\/www.gaodonghe.cn\/?page_id=94\">under sink water filter specifications<\/a> on the product page.<\/p>\n\n\n<p class=\"wp-block-paragraph\">The four stages, in order: a pleated sediment filter, an activated-carbon-fiber stage, a second pleated sediment filter, and a chlorine-removal ultrafiltration membrane. The pleated stages catch the large particles, the carbon fiber takes out most of the residual chlorine and improves taste, and the final membrane gives the chlorine a second pass while filtering out bacteria, colloids and some viruses.<\/p>\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-font-size has-small-font-size\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.gaodonghe.cn\/?page_id=94\">More on the under-sink water filter<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-container-core-group-is-layout-710b95c3 wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--50);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--40)\">\n\n<h2 class=\"wp-block-heading has-text-align-center\">How to choose a water purifier: three steps first<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The order matters more than the brand. Step one, look at your water source and its quality &#8212; well water, river water, or municipal tap water: different impurities call for different systems. Step two, look at two numbers &#8212; the rated capacity and the flow rate &#8212; because they decide what the system costs you in the years after. Step three, and only then, the brand &#8212; a brand decides the price, not the quality of the water. I walk through all three steps, with real cases, in my <a href=\"https:\/\/www.gaodonghe.cn\/?page_id=61\">Buyer&#8217;s Guide<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-0aa01211 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.gaodonghe.cn\/?page_id=61\">Read the Buyer&#8217;s Guide<\/a><\/div>\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-base-2-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-710b95c3 wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--50);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--40)\">\n\n<h2 class=\"wp-block-heading has-text-align-center\">Latest from the blog<\/h2>\n\n\n\n<div class=\"wp-block-query is-layout-flow wp-block-query-is-layout-flow\"><ul class=\"wp-block-post-template is-layout-flow wp-block-post-template-is-layout-flow\"><li class=\"wp-block-post post-170 post type-post status-publish format-standard has-post-thumbnail hentry category-guides\">\n\n<hr class=\"wp-block-separator has-text-color has-contrast-3-color has-background has-contrast-3-background-color has-alpha-channel-opacity is-style-wide\"\/>\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-layout-flex wp-container-core-columns-is-layout-3a88641f wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:72%\"><h3 class=\"wp-block-post-title\"><a href=\"https:\/\/www.gaodonghe.cn\/?p=170\" target=\"_self\" >How to Choose a Water Purifier: 3 Basics to Settle First<\/a><\/h3><\/div>\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:28%\"><div class=\"wp-block-post-date has-small-font-size\"><time datetime=\"2026-10-14T12:02:26+08:00\">October 14, 2026<\/time><\/div>\n<p class=\"has-small-font-size wp-block-paragraph\">Author <a href=\"\/?page_id=2\" data-type=\"page\" data-id=\"2\">Donghe Gao<\/a><\/p><\/div>\n<\/div>\n\n<\/li><\/ul>\n\n<\/div>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-0aa01211 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.gaodonghe.cn\/?page_id=62\">Read the case studies<\/a><\/div>\n\n\n\n<div class=\"wp-block-button is-style-outline is-style-outline--2\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.gaodonghe.cn\/?page_id=61\">Browse the Buyer&#8217;s Guide<\/a><\/div>\n<\/div>\n\n\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-container-core-group-is-layout-710b95c3 wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--50);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--40)\">\n\n<h2 class=\"wp-block-heading has-text-align-center\">Before you buy a water purifier, read this<\/h2>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">How do you choose a whole house water filtration system for your home? Three steps. First, look at your water source and its quality &#8212; that decides which type of purifier you need. Second, read the parameters, not the advertising &#8212; it can save you a lot in maintenance costs. Third, a big brand or direct from the factory? Let your budget decide. The <a href=\"https:\/\/www.gaodonghe.cn\/?page_id=61\">guides<\/a> walk through each step in detail.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-0aa01211 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.gaodonghe.cn\/?page_id=61\">Go to the Buyer&#8217;s Guide<\/a><\/div>\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-base-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-710b95c3 wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--50);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--40)\">\n\n<h2 class=\"wp-block-heading has-text-align-center\">Frequently asked questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">How long are the housing and the cartridges covered?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The stainless steel housing is rust-free and leak-free for 10 years, and warranted for 10 years. The cartridges are designed for a 5-year life under ideal water conditions &#8212; real water differs from home to home, so they are warranted for 3 years under normal maintenance. When a cartridge gets clogged in daily use and the flow drops, a cleaning restores most of its capacity.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can ultrafiltration handle well water?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It depends on how cloudy the well is. The backwashable 0.1-micron PVDF whole-house prefilter is built for high-turbidity sources like well and river water &#8212; its cartridge rinses clean and works again. The 0.01-micron PVC under-sink ultrafiltration is for compliant municipal water; if you want to drink well water safely, add a PVDF whole-house prefilter at the point of entry. The two stages divide the work &#8212; one guards the house, one guards the tap.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ultrafiltration or reverse osmosis &#8212; how do I choose?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ultrafiltration keeps the minerals in your water, runs without electricity and wastes no water &#8212; on compliant municipal water it is the low-hassle choice for most families. Reverse osmosis removes far more dissolved solids &#8212; it suits hard-water areas or families who want fully demineralised water. I have written both sides honestly; choose by your water source and your budget.<\/p>\n\n\n<\/div>\n\n\n\n<script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"FAQPage\",\n \"mainEntity\": [\n  {\n   \"@type\": \"Question\",\n   \"name\": \"How long are the housing and the cartridges covered?\",\n   \"acceptedAnswer\": {\n    \"@type\": \"Answer\",\n    \"text\": \"The stainless steel housing is rust-free and leak-free for 10 years, and warranted for 10 years. The cartridges are designed for a 5-year life under ideal water conditions \u2014 real water differs from home to home, so they are warranted for 3 years under normal maintenance. When a cartridge gets clogged in daily use and the flow drops, a cleaning restores most of its capacity.\"\n   }\n  },\n  {\n   \"@type\": \"Question\",\n   \"name\": \"Can ultrafiltration handle well water?\",\n   \"acceptedAnswer\": {\n    \"@type\": \"Answer\",\n    \"text\": \"It depends on how cloudy the well is. The backwashable 0.1-micron PVDF whole-house prefilter is built for high-turbidity sources like well and river water \u2014 its cartridge rinses clean and works again. The 0.01-micron PVC under-sink ultrafiltration is for compliant municipal water; if you want to drink well water safely, add a PVDF whole-house prefilter at the point of entry. The two stages divide the work \u2014 one guards the house, one guards the tap.\"\n   }\n  },\n  {\n   \"@type\": \"Question\",\n   \"name\": \"Ultrafiltration or reverse osmosis \u2014 how do I choose?\",\n   \"acceptedAnswer\": {\n    \"@type\": \"Answer\",\n    \"text\": \"Ultrafiltration keeps the minerals in your water, runs without electricity and wastes no water \u2014 on compliant municipal water it is the low-hassle choice for most families. Reverse osmosis removes far more dissolved solids \u2014 it suits hard-water areas or families who want fully demineralised water. I have written both sides honestly; choose by your water source and your budget.\"\n   }\n  }\n ]\n}\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>Whole House &amp; Under-Sink Water Filters My name is Donghe Gao. I am an engineer with 11 years of experience in water and electrical work. Our factory directly supplies two kinds of equipment: whole house water filter systems, and under-sink ultrafiltration water filters &#8212; from stainless steel machining to filter R&amp;D, production and assembly testing, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-64","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.gaodonghe.cn\/index.php?rest_route=\/wp\/v2\/pages\/64","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gaodonghe.cn\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.gaodonghe.cn\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.gaodonghe.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gaodonghe.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=64"}],"version-history":[{"count":26,"href":"https:\/\/www.gaodonghe.cn\/index.php?rest_route=\/wp\/v2\/pages\/64\/revisions"}],"predecessor-version":[{"id":236,"href":"https:\/\/www.gaodonghe.cn\/index.php?rest_route=\/wp\/v2\/pages\/64\/revisions\/236"}],"wp:attachment":[{"href":"https:\/\/www.gaodonghe.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=64"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}