目前最安静的水槽下置（台下）净水系统是什么？

Product ⇅ Price ⇅ 滤芯容量 (gallons) ⇅ 流量 (GPM (Gallons Per Minute)) ⇅ 污染物去除能力 ⇅ 安装难度 ⇅ 保修 (years) ⇅ 需水压 (PSI (Pounds per Square Inch)) ⇅
Culligan US-2 Under Sink Drinking Water Filtration System
US 		£97.39 ≈ 500 gal 0.5 gpm 减少氯味和气味，阿特拉津，囊虫，铅，林丹，浑浊度，名义颗粒物 一级 易更换滤芯 — 100 psi

Two-stage under-sink carbon block filter that provides 500 gal capacity and 0.5 gpm flow with built-in LED filter life indicator. Suited for homeowners wanting basic point-of-use reduction of chlorine, taste/odor and common contaminants with simple cartridge changes.

Sources:
McCoy's Building Supply Fuller and Son Hardware & Lumber Lowe's
搜索购买:
亚马逊 沃尔玛 易贝 速卖通 京东 淘宝
Aquasana AQ-5200+ Under Sink 2-Stage Water Filter System
US 		£93.64 ≈ 500 gallons 0.5 gpm 减少78种污染物，包括氯、铅、PFAS (PFOA/PFOS)、微塑料、囊虫、挥发性有机物、石棉、汞、除草剂、杀虫剂、药物残留 自行安装；无需水管工 1年有限保修 20-80 psi

Two-stage Claryum filtration combines activated and catalytic carbon with ion exchange and sub-micron filtration to remove a wide range of contaminants while retaining beneficial minerals. Suited for households wanting an under-sink, DIY-installed system with 500-gallon filter life and NSF-tested contaminant reduction.

Sources:
Aquasana Home Depot Consumer Reports (shop link)
搜索购买:
亚马逊 沃尔玛 易贝 速卖通 京东 淘宝
Waterdrop G3P600 Reverse Osmosis System WDG3P600
US 		£321.40 ≈ CF 6个月 550 gallons；CB 12个月 1100 gallons；RO 24个月 2200 gallons 600 GPD；约6-8秒注满6-8盎司杯 去除总溶解固体 (TDS)、PFAS、氟化物、砷、铅、氯、异味、PFOA/PFOS DIY 安装约30分钟；需要水槽下电源插座；中等难度 1年制造商保修 14.5 psi 到 87 psi

Tankless 8-stage RO delivering up to 600 gallons per day with a 2:1 pure-to-drain ratio, built-in pump and smart LED faucet with TDS monitor. Suits households wanting high-capacity, fast-flow purified water with space-saving under-sink installation.

Sources:
Waterdrop official store The Home Depot Waterdrop product page
搜索购买:
亚马逊 沃尔玛 易贝 速卖通 京东 淘宝
3M Aqua-Pure AP Easy Complete Under Sink Water Filtration System
US 		£161.05 ≈ 2839 l 2.8 l/min 颗粒物、氯味和气味、石棉、囊虫、铅、汞、特定挥发性有机化合物、阿特拉津、苯、卡布福兰、林丹、对二氯苯、托克辛、微塑料、药物残留、干扰内分泌的化合物 需为水龙头钻 14mm 孔；典型安装可能需要水管工 — 172-827 kPa

Compact under-sink system with a dedicated faucet, 0.5 μm carbon-block filtration, NSF 42/53/401 certification, and a 750 gallon (2839 l) capacity suited for households wanting improved taste and reduction of a wide range of contaminants.

Sources:
3M (product page) DrinkingWellCo Jestac (reseller)
搜索购买:
亚马逊 沃尔玛 易贝 速卖通 京东 淘宝
iSpring RCC7AK 5-Stage Under Sink Reverse Osmosis System
US 		£164.79 ≈ — 75 GPD 可去除超过1000种污染物的高达99%，包括氯、氟化物、铅、砷、石棉 适合 DIY，推入式接头；提供在线支持视频（适合自行安装） 终身美国本土技术支持；可购买延长保修 45 - 70 psi

iSpring RCC7AK is a high-capacity under-sink reverse osmosis system rated 75 gallons per day with alkaline remineralization for improved taste. It removes a wide range of contaminants and is designed for DIY installation using push-to-connect fittings, making it suitable for households wanting bottled-water quality at home.

Sources:
iSpring (official) The Home Depot iSpring (alternate product page)
搜索购买:
亚马逊 沃尔玛 易贝 速卖通 京东 淘宝
CuZn UC-200 Under Counter Water Filter
US 		£112.34 ≈ 50000 gallons 2 GPM 氯、氯胺、铅、汞、六价铬、镉、除草剂、杀虫剂、沉积物、藻类、霉菌、口感和气味 简单（连接冷水管线；需活动扳手） 5年按比例保修 —

The CuZn UC-200 is a long-life under-sink filter rated for about 50,000 gallons (up to 5 years) using KDF and coconut-shell carbon media to remove chlorine, heavy metals and common contaminants while retaining beneficial minerals. It installs directly to the cold-water line with minimal tools and suits households wanting low-maintenance, high-capacity point-of-use filtration.

Sources:
APEC Water
搜索购买:
亚马逊 沃尔玛 易贝 速卖通 京东 淘宝