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💧 Pure water, zero compromises—drink smarter, live better.
The iSpring RO400 is a cutting-edge tankless reverse osmosis water filtration system delivering up to 400 gallons of purified water daily with an ultra-efficient 2:1 pure-to-wastewater ratio. Its advanced 4-in-1 PCT filter removes over 99% of 1,000+ contaminants including lead and fluoride, while a smart filter life indicator ensures hassle-free maintenance. Designed for easy under-sink installation, its compact footprint saves up to 70% space, making it the ideal choice for eco-conscious professionals seeking fast, clean hydration.
| ASIN | B0D35FH65Q |
| Best Sellers Rank | 131,556 in DIY & Tools ( See Top 100 in DIY & Tools ) 92 in Under-Sink Filters |
| Brand | iSpring |
| Capacity | 400 gallons_per_day |
| Container Type | Glass |
| Country Of Origin | China |
| Customer Reviews | 4.3 out of 5 stars 18 Reviews |
| Included Components | Under Sink Water Filter, 3/8"&1/2" Adapter, Faucet, Mounting Bracket |
| Included components | Under Sink Water Filter, 3/8"&1/2" Adapter, Faucet, Mounting Bracket |
| Installation Type | Under Sink |
| Item Dimensions L x W x H | 38.5L x 13.5W x 39.3H centimetres |
| Manufacturer | iSpring Water Systems |
| Manufacturer Part Number | RO400EU |
| Material | Plastic |
| Material Type | Plastic |
| Maximum Flow Rate | 0.4 Gallons Per Minute |
| Model Name | FPCT400 |
| Model Number | RO400 |
| Number of Items | 1 |
| Other Special Features of the Product | Removes up to 99% of more than 1,000 harmful contaminants such as chlorine, fluoride, lead (up to 98%), arsenic, asbestos, calcium, sodium, sediment, sand, odours, etc. |
| Power Source | Corded Electric |
| Product dimensions | 38.5L x 13.5W x 39.3H centimetres |
| Purification Method | Reverse Osmosis |
| Special feature | Removes up to 99% of more than 1,000 harmful contaminants such as chlorine, fluoride, lead (up to 98%), arsenic, asbestos, calcium, sodium, sediment, sand, odours, etc. Special feature Removes up to 99% of more than 1,000 harmful contaminants such as chlorine, fluoride, lead (up to 98%), arsenic, asbestos, calcium, sodium, sediment, sand, odours, etc. See more |
| UPC | 810004175327 |
| Unit Count | 1.0 count |
K**R
Great product.
Easy to install, great quality water.
J**K
Very good water filter , great service
I would like to highly recommend this water filter system , very easy installation , very efficient and fast customer service ( Francis always to support and help ) very fast response to messages
D**.
Item is perfect
Item is 100% Arrived early, good instructions for self install. Only uses 85watts when in use. Highly recomend this product.
R**T
You won't find the PCT filter replacement
Good product but when it comes to replace the filter you wouldn't find it so think twice before purchase.
M**N
Creates smooth and soft water!
I live in a new build on the coast line in the uk, which creates very hard water and little space under my sink to buy a water filter cylinder. So, the ispring RO system was perfect choice for me. Really easy to install and use as there is a paper manual and also videos in the products details. The water is very smooth and tastes like good clean water without the chlorine tatse(especially compared to the normal tap). The unit fits perfectly in my single under sink cupboard and I still have space to store other things. Overall I would say the unit a great value for money, easy to install and use and the quality is definitely 5/5 stars.
A**S
Good water system, fittings not customisable
PROS: I have had this system installed for about three weeks now and it is very good. I have a TDS meter and the water from this system is far FAR cleaner than the bottled mineral water and tap water I tested it against. Well worth the investment. I ended up installing the system myself, so it’s straightforward enough for a DIYer to do. CONS: a couple of months before I purchased this water system, I had contacted the manufacturer to ask whether they could customise an order to include the antique wine tap instead of the chrome tap, which they said they couldn’t do. The system comes with a chrome tap as standard. My kitchen fittings are copper so I had to purchase the antique wine tap separately which cost an additional £86, so altogether quite an expensive purchase. If not for that I would have given 5 stars.
C**.
Nicely built system
Been a year since I installed this system. So far so good and does the job. Water taste is clean and fresh. Good built system
A**R
Wastes too much water during self-clean 20 minutes after use
The advertised 2:1 useful to wasted water ratio is a gimmick. In my house in London suburbs I have hard water and having captured the water from drain pipe after filling a small cup I could see it was 1:1. But then 20 minutes later the filter went into self-clean mode and sent down the drain another 850ml of water. This self clean is not advertised and only mentioned at the end of the manual in what seems like machine translated English. When I asked the support for comments they just closed my ticket without a response. ----- Updated on 30 Jun 2025 I have returned RO400 and bought RO500AK as I couldn't find in reviews or elsewhere online any information about self cleaning. Alas although the algorithm is different yet it still does self clean itself arguably more often than RO400. The customer support was very responsive in answering my questions explaining what it does and when. I've decided to stay with RO500AK mostly for its builtin remineralisation filter, and cause I'm hoping in the long run it's a greener solution than buying bottled water.
Trustpilot
5 days ago
1 week ago