Why You Need a Multi-Stage Water Filter

At any given time, tap water may contain various types of contaminants that may alter the taste or appearance of water, or that might downright cause illnesses or gastrointestinal problems.

Despite the rigorous safety standards tap water must comply with, old plumbing systems or old faucets can cause various unwanted contamination issues like bacterial build-up, or lead and other metals leaching into the water. Likewise, accidental contamination of the water supply in industrial areas is also a potential risk.

In such cases, single-stage filters may not be enough to successfully remove all the contaminants that may be lurking in your tap water.

If you’re thinking of buying a water filter for your home, read this article to find out why a multi-stage water filter is the best filter option for your home.


Single-Stage vs Multi-Stage Filters — Which is Better?

Single-stage water filters are those that contain a single filter cartridge with only one type of filter media (e.g. a water filter with a single carbon block filter cartridge). In contrast, multi-stage water filters are those that contain multiple filter cartridges that have various filter media.

Sometimes, a water filter may  only have a single filter cartridge, however, that filter cartridge may contain a combination of filter media, thus, forcing tap water to pass through multiple filter media.

Filter systems that contain a blend of filter media or multiple filter cartridges of different types are preferable over single-stage water filter systems, because one type of filter media cannot deal with all tap water contamination issues at once.

For example, while activated carbon water filters may be excellent at improving the taste of tap water, and removing chlorine and volatile organic compounds, they are not particularly adept at dealing with the presence of lead or pathogenic bacteria in your tap water. But add a carbon block filter to a reverse osmosis membrane, and you’ll be able to tackle even bacteriological issues and the presence of heavy metals.

Thus, the more contaminants are removed from your tap water, the safer and healthier the water.

These multi-stage filters are particularly suitable for you if you’re pregnant, nursing an infant, or have an autoimmune disease, because they can offer a better protection against disease-causing microorganisms and other substances that may be harmful for the development of the foetus or baby.

So, should you always get a multi-stage filter system?

While multi-stage water filters are undoubtedly superior to single-stage systems, there are cases when a multi-stage system may not be a particularly good choice. Some multi-stage systems can come with bulky equipment, which may take up a lot of space if you live in a small rental or apartment.

Likewise, most multi-stage systems may not thrive in low-pressure environments, which would prevent you from getting the best out of your water filter system. In such cases, we advise getting a single-cartridge filter that contains a blend of filter media  like the H2O US3 6 Stage Advanced Water Filter System, which features a single long-lasting filter cartridge that contains silver impregnated carbon, riolite, granular activated carbon, and KDF filter media.


Best Multi-Stage Water Filters to Consider in 2018

If you’re looking for an advanced undersink multi-stage filter or a high-power whole house water filter with multiple stages of filtration, check out our recommendations below:

BMB-30 NOVA PRO Direct Flow 9-Stage Reverse Osmosis System


This direct flow reverse omosis filter is installed at a single point of use and features 9 long-lasting filter cartridges. The system combines various sediment filters, carbon block filters, two reverse osmosis membranes, and three filter cartridges with anti-oxidant and alkalanising properties.

Pre- and post-filters in the BMB system are replaced every 12 months, while the RO membranes last up to 36 months.

The system can produce up to 1000 litres of water per day, which makes it suitable for larger homes, and even commercial use.

The system removes hundreds of contaminants and is equipped with a water monitoring system that tracks filter lifetime, system errors, and water temperature, helping you keep an eye on the performance of the system.

In contrast with traditional reverse osmosis systems, the BMB-30 does not feature a reverse osmosis tank, and filtered water is delivered to you immediately as you turn on the tap.

Osmio PRO-III-XL Ultimate Whole House Water Filter System

Whole house water filters like this multi-stage Osmio Pro-III-XL system are a great choice if you want to get filtered water not only for drinking and cooking, but also for bathing, laundry, and other household activities.

Whole house water filters filter tap water before it’s distributed to every water outlet in your house, which ensures that filtered water is available no matter which tap you turn on in your home.

The Osmio Pro-III-XL whole house water filter system is a 3-stage filter that uses an active ceramics filter with a blend of 4 types of ceramics, a 5-micron carbon block filter, and a granular activated carbon filter with KDF media. This combination of filter cartridges ensures that the system removes all common tap water contaminants including chlorine, pathogens, fluoride, heavy metals, hormones and more.

The active ceramics filter has a fantastic filter lifetime of 3 years, while the two other filter cartridges in the system need changing every 6 and 12 months respectively.

If you live in a medium or large house, this whole house water filter can be a perfect choice to improve the quality of your drinking water, and enjoy contaminant-free tap water at any water outlet in your home.


Whether you’re looking for an under-sink water filter or a whole house filtration unit, make sure you know what type of contaminants you need to target before you invest in a water filter system in your home. If you’re struggling with lime-scale build-up, we recommend choosing a filter with scale inhibiting properties, so you can protect your home appliances.

If the water pressure in your home is not compatible with a reverse osmosis system or other multi-stage filters, we recommend using a single-cartridge multi-stage filter (e.g. inline water filters) that can perform reliably in low-pressure environments as well.


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