All RO Membranes are rated for a specific Stabilized Salt Rejection. Many retail membranes are rated to Stabilize around 94-96% Rejection.

SpectraPure tests all of our membranes for rejection, and we stand by our guarantee of Standard 98% Rejection, and our SpectraPlus 99% Rejection.

What does that mean for my water and TDS?

The higher the rejection, the more impurities are removed by the membrane. This is especially important when working with Aquariums. The higher the TDS coming out of the membrane, the more contaminants your DI will have to remove; causing them to exhaust faster and requiring more frequent filter changes.

While Membranes remove the majority of contaminants from your water, picking the right pre-filters (Sediment and Carbon) is imperative to assist the membrane in removing TDS from your water, as well as maintaining the health and lifespan of your membrane and DI.

If you have further questions, you can contact SpectraPure Support for more information.

In Reverse Osmosis (RO) water systems, sediment filters are used to remove larger particles like sand, silt (dirt in general) The effectiveness of a sediment filter is often indicated by it's Micron Rating.

Sediment Micron Rating refers to the size of the particles that the filter is capable of removing from the water. It’s essentially a measure of the filter’s pore size. The smaller the micron rating, the finer the filtration.

20 Micron: This is a common rating for sediment filters. It removes larger particles like sand and some types of algae.

10 Micron: This rating is often used in a second sediment filter stage, removing smaller particles and some larger microorganisms.

5 Micron: These filters can remove smaller sediments, including clay and silt, that may pass through standard filters.

1 Micron: Filters with this rating are capable of removing very fine particles and some larger microorganisms.

If you have further questions, you can contact SpectraPure Support for more information.

Sediment filters in Reverse Osmosis (RO) systems come in several styles, each with its own method of trapping and removing particulate matter.

Here are the most common types:

1. Pleated Filters: These filters have an accordion-shaped design with a large surface area. They trap sediment in their filter layers, and the trapped debris supports the mechanical filtering process and amplifies its efficiency. Pleated filters can often be washed and reused.

2. String-Wound Filters: These filters are made by winding a string or cord around a core. The tightness of the winding determines the micron rating. They are effective at trapping a range of particle sizes.

3. Spin-Down Filters: These filters use a spinning action to separate sediment from the water. They are often used as pre-filters to protect more delicate downstream filters from large particles.

4. Melt-Blown Filters (also known as Spun Filters): These filters are made from a type of polypropylene that is heated and blown into a cylindrical shape. They use depth filtration, with layers of filter media that gradually decrease in pore size as the water reaches the filter’s center.

5. Bag Filters: These filters are bags made of a filtering material. They are often used in industrial applications to filter out large amounts of sediment.

Each of these filter types has its own advantages and disadvantages, and the best choice depends on the specific needs of your water supply. Factors to consider include the type and amount of sediment in your water, the desired flow rate, and whether the filter needs to be reusable.

If you have further questions, you can contact SpectraPure Support for more information.

In Reverse Osmosis (RO) water systems, carbon filters play a crucial role
in removing contaminants and improving the taste and odor of the water. The effectiveness of a filter is often indicated by its Micron Rating.

A Micron Rating refers to the size of the particles that the
filter is capable of removing from the water. It’s essentially a measure of the
filter’s pore size. The smaller the micron rating, the finer the filtration.

5 Micron: Best suited for sediment removal, 5-micron filters are ideal for
whole-house filtration systems where large volumes of water need to be
filtered quickly without compromising performance. They also offer some
protection against larger organisms like Giardia lamblia and cysts but
not against smaller pathogens, such as E. coli. Therefore, you shouldn’t
rely solely on 5-micron filters to combat bacterial contamination.

1 Micron: 1-micron filters can remove many bacteria and parasites, including E.
coli, Salmonella typhimurium, Shigella dysenteriae, and some viruses
like the Hepatitis A virus (HAV). The pore structure of these filters
helps provide adequate protection against harmful contaminants in many
public drinking water sources.

0.5 Micron or less: Also known as ultra-fine filters, 0.5-micron filters can eliminate most
bacteria, cysts, protozoa, and other contaminants such as PFAS, microplastics, and other chemicals from your water.

They can also eradicate larger ones, such as Giardia lamblia and
Cryptosporidium, linked to human gastrointestinal illnesses. But that’s
not all. Filters with such a low micron rating can eliminate
particulates and reduce chlorine, organic chemicals, lead, and other
heavy metals.

If you have further questions, you can contact SpectraPure Support for more information.

Different Resins for a reason
We here at SpectraPure take our resin seriously. We test the best resins from around the world to ensure we're producing the highest quality DI resins and cartridges on the market.

Custom formulas for higher purity
All of our cartridges are formulated and produced in our warehouse, and have been for over 30 years.

We developed the MaxCap cartridge to be used as a roughing filter. It helps keep your downstream filters healthy, saving you money.

The SilicaBuster is perfect for areas with high Silica, with high capacity to keep your tank safe and clean.

Our Mixed-Bed cartridges are industry leading, 18.2mohm Resistivity creates ultra-pure water, the same water used in laboratories and universities. That means 0TDS is all you'll be seeing for a while.

We offer Bulk Resin and Refillable Cartridges, as well as High Capacity that have 33% more capacity than our standard cartridges.

Higher capacity than our competitors, higher purity than anyone else.

We rinse and mix all of our own resins, and actively test our own cartridges to monitor performance; and every cartridge is hand built and packaged, ensuring quality at every step.

We are a Water Company
Water is our passion. We know it and work with it every day, and we pride ourselves on creating products that perform and last for years to come


If you have further questions, you can contact SpectraPure Support for more information.

Production Rates of RO Systems and Membranes are relative to your water source TDS, pressure, flow restrictor, and type of water coming from the source (Hard/Soft).

When you see a system advertised as 2:1 or 1:1 production, in most instances it is in fact false advertising. They are just trying to sell you more membranes more frequently.

Most houses and apartments have Hard Water, which is why standard RO Systems operate at a 3:1 ratio to help extend the life of the membrane and prevent excessive creep/leaching of TDS through your product water. It also helps prevent the concentration of calcium and magnesium from scaling the membrane, which ends up lowering quality and production, and forces you to purchase a new membrane.

In order for a membrane to produce a 2:1 ratio, you must have a Water Softener on your water source before the system. Without it, you will switch you membrane more frequently than normal.

In order for a membrane to produce a 1:1 ratio, your system needs a few things to continue to operate optimally and prevent damage to the membrane:

1. Pure Water Flush to rinse the membrane
2. A Booster Pump to help maintain higher pressures on the membrane
3. Soft Water

SpectraPure prides ourselves on designing and manufacturing systems that and last. Tested in Tempe, AZ on some of the worst water in the nation, we innovate so our systems can perform in any environment. We choose only the best filters and parts to help you get the pure water you need, without excessive filter changes.

If you have further questions, you can contact SpectraPure Support for more information.