iSpring F28K75 3-Year Replacement Supply Set for 6-Stage Reverse Osmosis RO Water Filtration Systems with Alkaline Mineral Filter, White

Retail Price: $ 133.55

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Reverse Osmosis Membrane

4th Stage

The reverse osmosis membrane is a thin film composite membrane that can remove up to 99% of over 1, 000 contaminants in the water, including lead (removes up to 98% of lead), chlorine, fluoride, arsenic, asbestos, calcium, sodium, and more.

Tested by independent third-party to meet NSF/ANSI Standards, iSpring Reverse Osmosis Membrane is made of food-grade high capacity material that provides high packing density to remove contaminants. With the 0.0001 micron size, it only allows water molecules to squeeze through and virtually nothing else.

As the heart of a Reverse Osmosis System, each iSpring Reverse Osmosis membrane has been inspected under the highest standards in the industry and has passed the quality check before it’s shipped to each customer. It is recommended that you replace the reverse osmosis membrane every two to three years.

Membrane Sizes

MC1: 100GPD Reverse Osmosis Membrane
MC7: 75GPD Reverse Osmosis Membrane
MC5: 50GPD Reverse Osmosis Membrane
For higher GPD usage, please visit iSpring for commercial grade RO systems

6th Stage Alkaline Remineralization Filter

The RO membrane removes not only harmful pollutants but also most healthy minerals. As a result, a standard 5 stage RO system produces slightly acidic water with a pH of 7.0 or less.

As the 6th stage Alkaline Remineralization filter, iSpring alkaline filter (FA15) restores healthy minerals and produces a balanced alkalinity, giving the water a better taste. It uses all natural mineral stones as the filtration media and never sacrifices quality for quantity.

It can last up to 6-12 months depending on your source water and usage.

Sediment Filter

The Sediment Filter works as the first barrier in the Reverse Osmosis System, removing solid particles like silt, rust and dirt from the water and reducing a significant percentage of contaminants in the water. It prevents the other filters from getting clogged with fine particles and reduces the risk of damages to the other components.

iSpring’s first stage Sediment Filter (FP15) features a 5 micron size, perfect for capturing most of the fine sediments in the municipal water and preventing issues from clogs and pressure loss with filters that have smaller micron sizes.

Granular Activated Carbon Filter

Activated Carbon filters can trap and absorb organic chemicals and chlorine from the water effectively with its ability of mechanical filtration and physical adsorption. It can efficiently remove odors and improve the water taste.

Furthermore, the iSpring 2nd stage Granular Activated Carbon (GAC) filter (FG15) includes special carbon media that filters out impurity in the water, which can efficiently protect and prolong the lifespan of the reverse osmosis membrane.

Carbon Block Filter

Post Carbon Filter

iSpring 5th Stage Post Carbon filter (FT15) works as the final stage in the RO system to capture any particles that may have accumulated inside the tank before pure water is delivered to the faucet. It can last up to 12 months depending on your source water and usage.

1st Stage

2nd Stage

3rd Stage

5th Stage



Sediment Filter	✓	✓	✓
Granular Activated Carbon Filter	✓	✓	✓
Carbon Block Filter	✓	✓	✓
Post Carbon Filter	✓	✓	✓
Alkaline Remineralization Filter	✓	✓	✓
75 GPD RO Membrane		✓	✓

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iSpring F28K75 3-Year Replacement Supply Set for 6-Stage Reverse Osmosis RO Water Filtration Systems with Alkaline Mineral Filter, White

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Product introduction

Shipping Notices

The F28K75 3-year filter pack comes with a total of 28 replacement filters so the filters can be changed on schedule for 3 years.

From the manufacturer

Reverse Osmosis Membrane

4th Stage

Membrane Sizes

MC1: 100GPD Reverse Osmosis Membrane
MC7: 75GPD Reverse Osmosis Membrane
MC5: 50GPD Reverse Osmosis Membrane
For higher GPD usage, please visit iSpring for commercial grade RO systems

6th Stage Alkaline Remineralization Filter

The RO membrane removes not only harmful pollutants but also most healthy minerals. As a result, a standard 5 stage RO system produces slightly acidic water with a pH of 7.0 or less.

It can last up to 6-12 months depending on your source water and usage.

Sediment Filter

Granular Activated Carbon Filter

Carbon Block Filter

Post Carbon Filter

1st Stage

2nd Stage

3rd Stage

5th Stage



Sediment Filter	✓	✓	✓
Granular Activated Carbon Filter	✓	✓	✓
Carbon Block Filter	✓	✓	✓
Post Carbon Filter	✓	✓	✓
Alkaline Remineralization Filter	✓	✓	✓
75 GPD RO Membrane		✓	✓

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Chinese medicine is limited to ship by Chinese exporting goods.

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Any side must be less than 60cm，otherwise you will be charged the greater one between real weight and volume weight，more than 120cm will be not accepted.