iSpring F28K75 3-Year Filter Replacement Supply Set For 6-Stage Reverse Osmosis Water Filtration Systems
About this item
- Tested by independent third-party to meet NSF/ANSI standard, high capacity replacement filters for 6-stage reverse osmosis systems. TDS rejection rate up to 97% (under NSF58 testing condition) Standard sized 10" x 2.5"
- Fits spring RCC7AK, RCC7P-AK, and most other RO systems that use standard sized filter housings including Flowmeter, Purloined, Crystal Quest, and Apec
- Includes 6x FP15 sediment filters, 6x FG15 GAC filters, 6x CTO carbon filters, 1x RO membrane, 3x FT15 post carbon filters, and 6x FA15 alkaline filters
- Each filter is individually wrapped to preserve freshness and extend shelf life
Frequently Bought Together

iSpring F28K75 3-Year Filter Replacement Supply Set For 6-Stage Reverse Osmosis Water Filtration Systems


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.

6th Stage Alkaline Remineralization Filter
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
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.

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

- Availability: In Stock
- Model: F28K75
- Manufacturer: iSpring
Reviews with images

Write Review
-
iSpring FG15 GAC Granular Activated Carbon 2.5"x10" Water Filter Replacement, 2.5" x 10"
$21.99 -
iSpring FC15 Standard 10 inch CTO Carbon Block Water Filter Cartridge Replacement, 5 Microns
$22.99 -
iSpring FP15 5 Micron 10"x2.5" Standard Sediment Water Filter Filter Cartridges
$18.99 -
iSpring F3 10"x2.5" Standard Replacement Prefilter Cartridges for Reverse Osmosis and 3-Stage Water Filtration Systems, Pre-filter
$38.99 -
Greatwell MC7 Reverse Osmosis (RO) Membrane Replacement 75 GPD, 11.75” X 1.75”
$37.99 -
iSpring FA15 10-inch Inline 3-Layer Alkaline Replacement Water Filter Cartridge
$33.99 -
iSpring FT15 5th Stage Inline Post Carbon Filter Replacement Cartridge, White
$18.99 -
iSpring WGB32B Whole House Water Filter System, Highly Reduces Sediment, Taste, Odor, and up to 99% Chlorine, 3-Stage w/ 20-Inch Sediment and Carbon Block Filters, 1" Inlet/Outlet
$516.99 -
iSpring F9K 10"x2.5" Standard 6-Stage Alkaline Reverse Osmosis Water Filtration Systems 1-Year Filter Replacement Cartridges, 9-piece
$69.24 -
iSpring F19K75 2-Year Filter Replacement Supply Set For 6-Stage Reverse Osmosis Water Filtration Systems
$139.99 -
iSpring WGB32BM Whole House Water Filter System, Reduces Iron, Manganese, Chlorine, Sediment, Taste, and Odor, 3-Stage Iron Filter Whole House
$535.99 -
iSpring WSP Reusable Whole House Spin Down Sediment Water Filter, 1" MNPT 3/4" FNPT w/Push to Connect Fittings, Lead-Free Brass
$46.54 -
iSpring F4AK 10"x2.5" Standard Water Filter Packs Replacement Cartridges for 6 Stage Reverse Osmosis, 6-Month Supply, No RO membrane
$41.99 -
iSpring RO500-BN, NSF Certified Tankless RO Reverse Osmosis Water Filtration System, 500 GPD Fast Flow, Brushed Nickel Faucet, 2:1 Pure to Drain Ratio, White
$631.99 -
Filmtec MC1US TW30-1812-100 100GPD Reverse Osmosis RO membrane filter cartridge
$59.99 -
iSpring RCC7AK-BLK 75 GPD Alkaline 6-Stage Reverse Osmosis System with Stylish Black RO Faucet, pH Remineralization RO Water Filter System Under Sink, Superb Taste Drinking Water Filter
$269.99