iSpring RO400 Reverse Osmosis System, Tankless Water Filtration System, 400 GPD Fast Flow Under Sink RO System with Brushed Nickel Faucet, 2.5:1 Pure to Drain Ratio, TDS Reduction, White

Easy to install, great quality water.

Good product but when it comes to replace the filter you wouldn't find it so think twice before purchase.

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

Item is 100% Arrived early, good instructions for self install. Only uses 85watts when in use. Highly recomend this product.

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.

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.

I fitted this under my kitchen sink inside a 600 sink unit, it was easy to fit for me has I have plumbing experience and even if I didn't it would have been easy for anyone to fit before fitting my water was registering 289 ppm on the tds meter which is absolutely disgusting the w.h.o. say it's not fit for drinking after fitting this my reading is now 15 to 19 parts per million andthat readingwas afterthefirstflushofthenew system,I felt it only right to make this clear to anyone wishing to purchase, I highly recommend

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.