You shouldn't have to choose between clean water and the building you call home… 

And yet in many condos and apartments, that's the choice people face. Tap water arrives already carrying contaminants your utility isn't required to remove. And in multi-unit buildings, shared pipes and aging infrastructure can introduce even more dangers, like toxic lead and disinfection byproducts. 

Many people in this situation dream of the same thing: a whole-home filtration system that handles everything automatically. The problem is that in a condo or apartment, whole-home filtration means connecting to shared infrastructure you don't own, which can require building approval, a licensed plumber, and a permit that never gets issued.

So the search for something in between begins…

• Whole-home filtration often requires plumbers, permits, and in most multi-unit buildings, management approval.

• Doing nothing isn't an option. Tap water in multi-unit buildings carries risks that start at the municipal source and can compound inside shared pipes. 

• Under-sink filtration is the closest equivalent to whole-home coverage a condo owner can actually have, but most systems still require permanent modifications that violate leases and HOA bylaws.

• The Clearly Filtered 3-Stage System makes filtered water flow through your existing faucet, requires no plumbing or permanent modifications, and tucks neatly underneath your sink.

Of everything available to a renter or condo owner, under-sink filtration is the closest thing to whole-home coverage you can actually have. Just flip on your faucet and filtered water flows, making everything from washing produce to filling bottles a breeze. 

The problem is getting there… 

You need to consider both the filtration technology as well as the form of the filtration system. The technology has to actually protect you from the dangers found in your tap water supply, and the form—or structure—determines whether you can have that system in a condo or multi-unit building at all.

The options easiest to install in a condo often protect you from too little. The options hardest to install often remove too much from your water, and in most condos and apartments, aren't really an option at all.

Ordinary Carbon Filters Let Hundreds Of Dangers Pass Through

Carbon-based filtration systems are available in several forms that work in a condo or apartment. Faucet-mounted filters, for example, don’t require any drilling. Some under-sink carbon filters can connect without a second dedicated spout. 

However, the technology remains an issue regardless of which form you choose… 

Basic carbon filtration is built to target chlorine to improve taste, but better taste doesn't mean better water. After all, that same carbon technology wasn't designed to catch lead, PFAS, pharmaceuticals, microplastics, and hundreds of other dangers found in public water supplies—including the ones most likely to show up in the shared pipes of a multi-unit building. 

Of the 324 contaminants detected in U.S. tap water, basic carbon filters typically target as few as 5. That’s why relying on a carbon filter to protect you and your loved ones from the dangers of tap water is like trying to catch the ocean with a coffee cup.

Reverse Osmosis Removes Everything, Including Healthy Minerals

Reverse Osmosis (RO) filtration systems sit at the other end of the spectrum. And for most renters and condo owners, the installation requirements end the conversation before it starts. RO systems often require a dedicated faucet, a drain line connection, a storage tank, and potentially a plumber. 

Countertop RO systems, on the other hand, were designed to get around all of that. There’s no dedicated faucet, no drain line, and no drilling required. But these systems occupy permanent counter space that was already scarce and often require filling a tank manually before the water is filtered, which puts you right back where you started.

Even if the form weren't an issue, the technology would be…

RO forces water through a membrane that removes nearly everything, including healthy minerals like calcium, magnesium, and potassium. In other words, the technology doesn't distinguish between what should stay and what should go. Without those minerals, many describe RO-filtered water as tasteless or dead. Meanwhile, many RO systems discard 3-4 gallons of water for every 1 gallon they filter. 

Put differently, more filtration isn't always better filtration.

What About Everything Else?

Beyond carbon and RO, there are other filtration technologies and proprietary combinations on the market. Ultrafiltration systems, for example, use a fine membrane that blocks bacteria and cysts while letting minerals through. But these systems typically don’t filter dissolved contaminants like fluoride, nitrates, or arsenic. 

Other systems layer multiple technologies together in hopes of covering more ground. Some do. But any system built around a reverse osmosis membrane brings the same installation requirements and the same mineral problem, regardless of what surrounds it.

You shouldn't have to choose between clean water and the building you call home. With the Clearly Filtered 3-Stage Under-the-Sink System, you don't have to. It’s the only portable under-sink filtration system that protects you from 232+ contaminants including lead, fluoride, and PFAS—without removing healthy minerals from your water. 

Think of it like adding a power strip between your wall outlet and whatever's plugged into it. The 3-Stage System connects directly to the cold water line already under your sink, filters the water as it passes through, and sends it up the line to the faucet you already have. 

Forget a plumber, power tools, or a second faucet—all it takes is a wrench. Because nothing is drilled, modified, or permanently changed, there's nothing to ask your landlord or HOA about. Close the cabinet door and enjoy. 

When you move, disconnect it and bring it to your next place. Whether you're leaving a rental or selling a condo, it moves with you.

Most renters and condo owners give up on filtered water because every option asks them to compromise—on protection, on installation, or on both. The Clearly Filtered 3-Stage Under-the-Sink System is the one that doesn't, allowing you to recreate the whole-home filtration experience without worrying about your landlord or HOA.