BOS Water
Real Tests. Real Results.

From compact filter pitchers to whole house water softeners, we test and compare home water treatment equipment to help you choose the best!

Featured Comparisons

our most popular product comparisons

Featured Videos

some of our most popular YouTube videos (→ visit our channel)

The Best Reverse Osmosis Systems of 2025 (We Tested 25 Popular Models!)

  • Link to Comparison Sheet
  • 00:00 – Intro
  • 00:39 – The 25 RO Systems
  • 03:43 – Our 3 Top Picks
  • 04:33 – Top 3: Lab Results
  • 07:57 – Top 3: NSF Certifications
  • 10:37 – Top 3: Taste & Odor
  • 11:34 – Top 3: Installation
  • 12:50 – Top 3: Day-to-Day Use
  • 16:02 – Top 3: Replacing Filters
  • 16:55 – Top 3: Wastewater
  • 18:38 – Top 3: Extra Notes
  • 20:06 – Top 3: Cost
  • 21:30 – Crowning the #1 RO
  • 22:15 – AquaTru Carafe
  • 22:59 – Bluevua Lite & Waterdrop A1
  • 24:22 – Waterdrop G3P800 & X12
  • 25:51 – Aquasana SmartFlow
  • 26:40 – USWS All American & Home Master TMHP-L
  • 28:10 – APEC ROES-50 Essence
  • 28:56 – Summary

Best Under Sink Water Filter in 2025? 19 Systems (Lab-)Tested!

  • Link to Comparison Sheet
  • 00:00 – Intro
  • 00:34 – How We Tested & Rated
  • 01:53 – Our Recommendations
  • 03:01 – Best Overall (Cloud RO)
  • 15:11 – 2 Best Tankless ROs (Waterdrop G3P600 & X12)
  • 27:26 – Best Non-RO Filter (Epic Smart Shield)
  • 31:22 – Highest Filtration Score (Aquasana SmartFlow)
  • 32:02 – Made in USA (USWS All American & Home Master TMHP-L)
  • 32:34 – Budget RO Pick (APEC ROES-50 Essence)
  • 32:51 – AO Smith AO-US-200 & Culligan US-EZ-4
  • 33:34 – Summary

Best Under Sink Reverse Osmosis System in 2025? 11 Filters (Lab-)Tested! [v2.0]

  • Link to Comparison Sheet
  • 00:00 – Intro
  • 00:22 – What’s New?
  • 01:11 – Our 11 Under Sink ROs
  • 01:54 – How We Tested & Rated
  • 05:08 – Our Recommendations
  • 06:11 – Best Overall (Cloud RO)
  • 20:57 – 2 Best Tankless Units (Waterdrop G3P600 & X12)
  • 35:38 – Highest Filtration Score (Aquasana SmartFlow)
  • 37:22 – Made in USA (USWS All American & Home Master TMHP-L)
  • 41:28 – Budget Pick (APEC ROES-50 Essence)
  • 42:50 – Summary

Best Countertop Water Filter in 2025? 26 Systems (Lab-)Tested!

  • Link to Comparison Sheet
  • 00:00 – Intro
  • 00:33 – Our 26 Countertop Filters
  • 03:14 – How We Tested & Rated
  • 09:11 – Best Overall (AquaTru Classic)
  • 14:33 – Best RO Budget Pick (AquaTru Carafe)
  • 16:50 – Honorable Mention (Bluevua RO100ROPOT)
  • 18:27 – Best “Regular” Filters (Aquasana CWM & ZeroWater)
  • 27:47 – Best “Regular” Budget Pick (Waterdrop ED04)
  • 33:04 – Summary

The Best Whole House Water Filter System in 2025… Tested in a Lab!

  • 00:00 – Intro
  • 00:19 – General Information
  • 00:52 – System Sizes
  • 01:43 – What’s Included?
  • 02:11 – Cost
  • 02:43 – Filtration Process
  • 04:13 – Pros & Cons
  • 08:33 – Taste Test
  • 09:58 – Lab Test
  • 15:46 – Personal Review
  • 16:53 – Outro

Best Countertop Reverse Osmosis System in 2025? 10 Filters (Lab-)Tested!

  • Link to Comparison Sheet
  • 00:00 – Intro
  • 00:27 – Our 10 Countertop ROs
  • 01:15 – How We Tested & Rated
  • 04:23 – System Setup & Filter Priming
  • 04:38 – Sampling Process
  • 05:41 – Lab Testing Disclaimer
  • 06:07 – Taste & Odor Test
  • 06:28 – Speed Test
  • 07:05 – Pure-to-Drain Ratio Test
  • 07:31 – Best Overall (AquaTru Classic)
  • 10:49 – Best Budget Pick (AquaTru Carafe)
  • 12:30 – Best for Hot Water (NU Aqua & APEC)
  • 15:30 – Honorable Mention (Bluevua)
  • 16:00 – Summary

Featured Products

our top-rated recommendations

The BOS Water Team

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Our Approach to Testing Products

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4 Images in 1 Showing Our Hands on Product Testing

Real-World, Hands-On Testing

1 of 2 core aspects of our approach to testing home water treatment equipment is that we actually test the products right on our home taps and water supplies, because nothing beats first-hand experience for spotting installation challenges, flow-rate surprises, or low build quality among other issues!

Independent Lab Analysis

The second core aspect is our lab testing: Whenever possible, we send “before” and “after” water samples to a certified, unbiased lab for analysis of the various impurity levels. We usually test each sample for more than 100 analytes including volatile organics, heavy metals, salts and minerals, radon, pH, TDS, and hardness.

Sampling of Waterdrop ED04
Speed Test Example Faucet Filters

More Testing

Depending on the type of equipment, we perform additional testing. For example, we test most water filters for filtration speed, taste & odor of the filtered water, and pure-to-drain ratio (reverse osmosis systems only).

Full-Spectrum Evaluation

Our evaluation takes into account all product aspects such as NSF certifications/testing, upfront and long-term costs, product warranties, any additional features, and all other pros & cons including frequent customer complaints.

google sheets sample
Lab Results Sample

Why Trust BOS Water?

Affiliate programs and free products allow us to keep our content free for everyone to access. That said, our opinions and ratings remain independent and we would never accept payment in exchange for a positive review. Plus, every lab report is published in full so you can inspect the data yourself. No spin. No surprises. Just clear, transparent advice you can rely on.

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