Kitchen 5 min read · June 5, 2026

Xiaomi Mijia Smart Water Purifier Review: Clean Water with App Intelligence

Xiaomi Mijia Smart Water Purifier brings RO filtration, real-time TDS monitoring, and app alerts to the kitchen tap at ¥1,299 — competitive with premium brands at half the price.

Introduction

China’s tap water quality concerns have made home water purifiers a necessity rather than a luxury for millions of households. The Xiaomi Mijia Smart Water Purifier (米家净水器) enters this competitive market at ¥1,299 (~$178 USD) with a compelling proposition: RO (Reverse Osmosis) filtration, real-time TDS monitoring via the Mi Home app, and Xiaomi’s ecosystem integration.

With 30,000+ reviews on JD.com and a 96% positive rating, the Mijia Water Purifier is one of the top-selling RO purifiers in China. But does it deliver on its promises? Let’s find out.

Specifications

Feature	Xiaomi Mijia Purifier	Xiaomi Mijia 600G	Midea RO Purifier
Price	¥1,299	¥1,999	¥1,499
Filtration	5-stage RO	5-stage RO	4-stage RO
Flow Rate	400G (1.0L/min)	600G (1.5L/min)	400G (1.0L/min)
TDS Reduction	≥95%	≥95%	≥93%
Filter Life	12-24 months	18-24 months	12 months
Filter Cost/Year	~¥199	~¥249	~¥299
App Monitoring	Mi Home (TDS, life, usage)	Mi Home	None
Tank	Tankless	Tankless	Tank
Waste Ratio	2:1 (pure:waste)	2:1	3:1
Installation	Under-sink	Under-sink	Under-sink
Dimensions	38 × 20 × 42 cm	40 × 20 × 43 cm	42 × 22 × 45 cm

Filtration Technology

The Mijia Water Purifier uses a 5-stage filtration system:

PP Cotton (Stage 1): Removes sediment, rust, and particles >5μm
Activated Carbon (Stage 2): Absorbs chlorine, odors, and organic compounds
PP Cotton (Stage 3): Secondary particle filtration at 1μm
RO Membrane (Stage 4): The star component — 0.0001μm pores remove heavy metals (lead, mercury, arsenic), bacteria, viruses, and dissolved solids
Post-Carbon (Stage 5): Polishes taste and removes any residual odors

The RO membrane is sourced from Dow/DuPont — the same supplier used by premium brands. TDS (Total Dissolved Solids) reduction is rated at ≥95%, bringing typical Chinese tap water from 150-300 TDS down to 5-15 TDS.

Smart Features

The Mi Home integration is where this purifier shines:

Real-time TDS monitoring: Check incoming and outgoing water quality on your phone
Filter life tracking: Each filter’s remaining life is displayed as a percentage
Usage statistics: See daily, weekly, and monthly water consumption
Leak detection: Built-in sensor alerts you if there’s a water leak
Filter replacement reminders: Push notifications when filters need changing

The tankless design means no waiting for a storage tank to refill. Water is filtered on demand, which is both more hygienic (no stagnant water) and more space-efficient.

Performance

The 400G model delivers approximately 1.0L of purified water per minute — filling a standard 250ml glass in about 15 seconds. This is adequate for drinking and cooking but might feel slow if you’re filling large pots.

The 2:1 pure-to-waste water ratio is competitive. For every 2 liters of purified water, 1 liter goes down the drain. This is better than many competitors at 3:1 or worse.

Filter replacement costs average ¥199 per year — about ¥0.50 per day. Compare this to bottled water delivery services that cost ¥300-500 per month.

What Chinese Users Say

Aggregated Ratings: 4.6/5 ★ (30,000+ reviews on JD.com, 96% positive)

“出水速度够用，水质从原来的180TDS降到了8TDS，喝着明显比自来水好。App能看水质变化，父母也觉得放心。安装师傅很专业，半小时就装好了。” — JD.com 李** ★★★★★* “Flow rate is adequate. Water quality dropped from 180 TDS to 8 TDS — noticeably better than tap water. The app shows water quality trends — gives parents peace of mind. Installer was professional, done in 30 minutes.”

“用了三个月，滤芯寿命显示还有85%，一年换一次应该差不多。唯一的缺点是橱柜下面要有电源，老房子需要接插线板。” — JD.com 王** ★★★★★* “Three months in, filter life shows 85% remaining — probably one replacement per year. Only downside: needs a power outlet under the cabinet. Old apartments may need an extension cord.”

“性价比很高，1299元比小米之家的报价还便宜。RO膜是陶氏的，跟大品牌用的一样。和小米净水器600G相比，这个更适合2-3口之家。” — JD.com 赵** ★★★★* “Great value at ¥1,299 — even cheaper than the Xiaomi store quote. RO membrane is Dow — same as big brands. Compared to the 600G model, this one is better suited for 2-3 person households.”

“小米净水器的滤芯更换很方便，一转一拉就换好了。比之前用的美的方便多了，那个要拆半天。App提醒也很及时。” — 小红书用户家居生活家 “Filter replacement on the Xiaomi purifier is super easy — twist and pull. Way more convenient than my old Midea, which required disassembly. App notifications are timely too.”

Pros & Cons

Pros:

Excellent TDS reduction (≥95%) with Dow RO membrane
Real-time monitoring via Mi Home app
Tankless design — hygienic and space-efficient
Competitive 2:1 waste water ratio
Easy twist-to-replace filter design
Affordable filter replacements (~¥199/year)

Cons:

400G flow rate is adequate but not fast (1.0L/min)
Requires under-sink power outlet
Professional installation needed (not DIY-friendly)
No hot water dispensing (cold only)
First few liters after filter change have plastic taste

vs Competitors

vs Midea RO Purifier (¥1,499): Midea has a longer brand history in water purification but uses a tank design that wastes under-sink space. No app connectivity. Xiaomi wins on smart features, design, and filter replacement ease.

vs Xiaomi Mijia 600G (¥1,999): The 600G offers 50% faster flow (1.5L/min) and slightly longer filter life. Worth the upgrade for families of 4+ who fill water bottles frequently.

FAQ

Q: Can I install it myself? A: Xiaomi recommends professional installation (included with purchase). DIY is possible if you’re handy with plumbing, but the included fittings require specific tools.

Q: What’s the annual cost of ownership? A: Approximately ¥199 for filter replacement + ~¥50 in electricity + ~¥100 in water (including waste). Total: ~¥350/year or about ¥1/day.

Q: Does it remove fluoride? A: Yes — the RO membrane removes fluoride along with other dissolved solids.

Q: Can it connect to both kitchen tap and a separate drinking tap? A: Yes — the system includes a dedicated purified water faucet that mounts alongside your existing tap.