SimPure T1-400 ALK UV: RO Filter With UV & Minerals

Jun 24, 2025

Searching for the best reverse osmosis water filter under sink? You might feel overwhelmed with choices. But after testing the SimPure T1-400 ALK UV tankless reverse osmosis system with remineralization, I can say that it is more than one-step ahead. Here’s my review after using it for a few weeks.

One of the first things that really impressed me was the tankless design. Unlike other reverse osmosis systems that have large storage tanks, this one provides clean water immediately without hogging room under your sink. That means no more waiting for a tank to fill up and no mess in your kitchen. It’s ideal for small spaces or for anyone who likes a clean, minimalist appearance.

Most RO systems remove minerals that create the natural taste of water. The SimPure T1-400 ALK UV features an alkaline filter that reinstates those good minerals, such as calcium and magnesium. The result? Fresh and balanced-tasting water with a pH level greater than 7.5. After several days, I could see my water felt smoother and more refreshing, certainly not the flat, bland water some RO systems create.

Water safety is always a top concern. This system uses UV light to kill any bacteria or viruses that might get past the filters. It’s like having an invisible shield protecting your water at all times. Knowing this gave me extra peace of mind, especially in today’s world when clean water can’t be taken for granted.

With the filtration capacity of 400 gallons a day, this system easily caters to a family’s water needs on a daily basis. I conducted a test on the water purity with and without filtration using a TDS meter, and the readings were astounding—nearly zero TDS, which translates to ultra-pure water. Additionally, due to remineralization, the water still tasted full of life and healthy minerals.

I appreciated the integrated pressure gauge that reminds you when it’s filter-replacement time. No more guesswork or calendar tracking. The filters themselves twist in and out quickly, so replacements are easy with no mess or leaks. Such a considerate design reveals just how easy-to-use the SimPure system is.

Hooking up the system was relatively easy. Just remember, if you need to connect it to an ice maker or refrigerator, you’ll need a separate pressure tank, which can be purchased separately. It’s a minor added step, but good to know ahead of time.

Overall, the SimPure T1-400 ALK UV tankless reverse osmosis system with remineralization is a fantastic choice if you want clean, mineral-balanced, and safe water without sacrificing space or convenience. It’s probably one of the best reverse osmosis water filter under sink options out there, especially for those who care about taste and health as much as purity.

If you desire a space-saving system that provides immediate clean water and replenishes healthy minerals, this is an excellent option. To me, it made water filtration a pleasure that I now look forward to using daily.

Photo: Simpurelife via their website.

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