Say No to Microplastics: The EcoWater ERO-385 Is Now Certified to Reduce Them

As of July 2026, the EcoWater ERO-385 reverse osmosis drinking water system carries two new third-party performance certifications — Particle Class 1 (the highest particulate reduction tier under NSF/ANSI standards) and certified microplastics reduction. Same trusted system, same price, now with proof on paper that it takes on one of today’s most talked-about contaminants.

What Are Microplastics, and Why Is Everyone Suddenly Talking About Them?

Microplastics are plastic fragments smaller than five millimeters — many of them far smaller than the width of a human hair. They break off from packaging, synthetic fabrics, tires, and aging water infrastructure, and they end up in rivers, reservoirs, and the pipes that carry water to your kitchen faucet.

A few years ago this was a niche scientific topic. Today it’s a dinner-table conversation. Researchers keep finding microplastics in places nobody expected, and homeowners are asking a very reasonable question: what’s actually in the water I’m giving my kids?

Here’s the honest answer for most Bay Area homes. Municipal water in California is treated to a high standard, and your utility does real work to deliver safe water. But treatment happens at the plant — not at your tap. Between the plant and your glass, water travels through miles of mains, service lines, and your own home’s plumbing. Older pipes, main breaks, and long travel distances all introduce contaminants that were never in the treated supply. That’s the gap a point-of-use drinking water system is designed to close.

Why Reverse Osmosis Is the Right Tool for the Job

Reverse osmosis works differently than a pitcher filter or a screw-on faucet filter. Instead of catching particles in a mesh, RO pushes water under pressure through a semi-permeable membrane with openings so small that dissolved solids, metals, and particulate matter simply can’t follow the water through.

To put the scale in perspective: microplastic particles of concern in drinking water are typically measured in microns. An RO membrane’s effective pore size is orders of magnitude smaller. That’s why water quality experts consistently point to reverse osmosis as the most effective residential option for reducing microplastics — it isn’t straining them out, it’s leaving them behind entirely.

The ERO-385 pairs that membrane with a multi-stage filter set, including a premium post-filter that also addresses PFOA/PFOS, DEET, ibuprofen, MTBE, and VOCs. In total the system is rated to reduce 92 contaminants and 99.1% of lead. It’s BPA-free, it lives quietly under your sink, and it delivers water through a dedicated faucet at the counter.

What the New Certifications Actually Mean

Two things changed for the ERO-385 as of July 1, 2026. Both matter, and both are worth understanding rather than just nodding at.

Particle Class 1

Particulate reduction under NSF/ANSI standards is graded in tiers based on the size of particles a system is proven to remove. Class 1 is the highest tier there is. It requires the system to demonstrate reduction of the smallest particle size range in the standard — and it has to hold that performance under stress: when the filter is brand new, when it’s heavily loaded, and when flow is cycled on and off after sitting idle. It’s not a lab-bench best-case number. It’s a durability test.

Certified Microplastics Reduction

This is the newer claim, and it’s built directly on the Class 1 result. When the standards bodies went looking for a way to verify microplastics performance, they concluded that the Class 1 nominal particulate reduction test — because of the particle sizes it covers and how rigorous the protocol is — was an appropriate measure of a system’s ability to reduce plastic particles. Systems that meet it can carry a certified microplastics reduction claim under NSF/ANSI 401.

Translation: this isn’t a marketing badge somebody designed in-house. It’s third-party verification, tested to a published standard, for a contaminant homeowners are actively worried about.

Very few drinking water systems carry both claims. The ERO-385 now does — with no change in price.

Who Should Consider One?

We install these systems throughout Santa Cruz, Monterey, San Benito, Santa Clara, San Mateo, Marin, Sonoma, and Napa counties, and the honest truth is that almost every household benefits. A few situations where it’s an especially easy call:

• You’re buying bottled water. Bottled water is a recurring cost, a plastic problem, and — ironically — a documented microplastics source. An under-sink RO system replaces it at a fraction of the long-term cost.
• You have young kids or you’re pregnant. Peace of mind about what goes into bottles, formula, and sippy cups is worth a lot.
• Your home is older. Original galvanized or aging copper service lines can contribute lead and particulate.
• You already have a water softener or refiner. RO is the perfect companion. A softener handles hardness for the whole house; RO handles what you actually drink and cook with.
• You already own an ERO-385. Your system may be eligible for the updated filter configuration — worth a conversation at your next service visit.
• You don’t love the taste of your tap water. Chlorine, chloramine, and dissolved solids are usually the culprit, and RO addresses all three.

What Installation Looks Like

An ERO-385 installation is a single-day job for our plumbers in the vast majority of homes. We install the manifold and membrane assembly under the sink, mount the storage tank, tie into a cold water supply, set the drain connection, and install a dedicated drinking water faucet at the counter — matched to your existing fixture finish. We pressure-test everything, flush the system, and walk you through filter changes before we leave.

Maintenance is simple: filters get changed on a schedule (every 1 – 2 years), the membrane lasts considerably longer (3 – 5  years), and we can put your system on a maintenance plan so you never have to track it yourself.

If you’d like higher pH water, an optional alkaline and remineralization filter installs right between the RO outlet and your faucet, raising pH as high as 9–10 and adding back safe minerals for taste.

Frequently Asked Questions

Does reverse osmosis remove microplastics? Yes. Reverse osmosis is widely regarded as the most effective residential method for reducing microplastics, because the membrane’s pore size is far smaller than the particles in question. The ERO-385 now carries a certified microplastics reduction claim verified by third-party testing.

What does Particle Class 1 mean? Particle Class 1 is the highest particulate reduction tier available under NSF/ANSI standards. It certifies that a system reduces the smallest particle size range covered by the standard, and that it holds that performance under demanding real-world test conditions.

Do I need an RO system if I already have a water softener? They do different jobs. A softener or refiner treats hardness — and in the case of a refiner, chlorine — for the whole house, protecting your pipes, water heater, and fixtures. Reverse osmosis is a point-of-use system that polishes the water you drink and cook with. Most of our customers end up with both.

Does the ERO-385 waste water? All reverse osmosis systems send some water to drain as part of the membrane flushing process. Modern systems are dramatically more efficient than older designs, and for most households the volume is comparable to a few extra minutes of dishwashing per day.

How much does an under-sink RO system cost to run? Filter changes are the main ongoing expense. Compared to buying bottled water for a family, most households come out well ahead within the first couple of years.

Can you install one in my home? If you’re in Santa Cruz, Monterey, San Benito, Santa Clara, San Mateo, Marin, Sonoma, or Napa County, yes. We install EcoWater drinking water systems every week across the Bay Area.