

Hero image 0 of iSpring FA15 Alkaline Water Filter Cartridge for Reverse Osmosis RO System 3-Layer 10-inch Inline Quick Connect Replacement or Add-on, pH Balance and Restore Minerals, 0 of 3
iSpring FA15 Alkaline Water Filter Cartridge for Reverse Osmosis RO System 3-Layer 10-inch Inline Quick Connect Replacement or Add-on, pH Balance and Restore Minerals
Key item features
- pH Balance: This filter restores healthy minerals like calcium, magnesium, and potassium ions, raising the pH of RO water by 0.5 to 1.2 to minimize body pH fluctuations.
- Mineral Restoration: It reintroduces natural calcium, magnesium, sodium, and potassium ions, which are readily absorbed and help the body hydrate more effectively.
- Enhanced Filtration: Designed as an inline cartridge with mineral balls, calcite media, and corosex, it complements RO systems by improving water quality and taste.
- Broad Compatibility: The filter is suitable for most under-sink water filtration systems, including various RO systems and name-brand models.
- Quick Connect: Features a secure push-fit quick connection for faster and easier filter replacement.
- Compact Dimensions: Measures 9 3/4" in length with a 2 7/8" outer diameter and a 1/4" fitting, weighing 2 lbs.
- Service Life: Provides a service life of 6 months or 1500 gallons, whichever occurs first.
Generated by AI
Specs
- Filtration stages3
- BrandiSpring
- Height10 in
- Rec. useResidential
- Weight0.06 lb
- ModelFA15
Current price is USD$21.6658.3 ¢/ea
Price when purchased online
- Free shipping
Free 30-day returns
How do you want your item?
Ships to
Arrives by Thu, Jun 18
|Sold and shipped by iSpring Water Systems, LLC
4.63063063063063 stars out of 5, based on 222 seller reviews(4.6)222 seller reviews
Free 30-day returns
About this item
Product details
Product Features
This Alkaline pH filter for Reverse Osmosis systems is an inline cartridge with mineral balls, calcite media, and corosex. The alkaline filter improves the pH value of the RO water which could be slightly acid after the reverse osmosis process. It also gives back healthy minerals such as ionized calcium, magnesium, sodium, potassium ion, which were taken away during the water purifying process.
This filter is capable of increasing the pH value of the RO water by 0.5 to 1.2, which helps minimize the fluctuations of your body's pH.
The minerals from the alkaline filter are natural calcium, magnesium, sodium, potassium ions, and others readily found in natural mineral water, which can be absorbed 100% by the human body. These ions are structurally smaller molecules which help the body take in more water and replenish lost water quickly. It also makes the water cleaner and healthier.Typically installed with RO systems to complement their absolute filtration quality.
Product Highlights
Fits most water filtration systems including RO systems, including name brand models.
What is included:
1 piece of Alkaline Remineralization Replacement Filter Cartridge
Specifications & Dimensions:
Length: 9 3/4", O.D. = 2 7/8" 1/4" Fitting Weight: 2 LBS Service life: 6 months or 1500 gallons, whichever comes first
Why iSpring?
Located in Alpharetta, Georgia for over a decade, iSpring Water Systems LLC is a family owned company specializing in reverse osmosis water filtration systems. Our products include residential and commercial reverse osmosis (RO) systems, whole house water systems, ultrafiltration systems, shower, faucet, and counter top filters, filter cartridges and housings, RO coolers, and kitchen faucets and fittings. Our aim is to make high-quality drinking water accessible for all households. With affordable pricing, solid quality, prompt delivery, and top notch customer service, we hope to assist in bringing you great water for years to come.
This Alkaline pH filter for Reverse Osmosis systems is an inline cartridge with mineral balls, calcite media, and corosex. The alkaline filter improves the pH value of the RO water which could be slightly acid after the reverse osmosis process. It also gives back healthy minerals such as ionized calcium, magnesium, sodium, potassium ion, which were taken away during the water purifying process.
This filter is capable of increasing the pH value of the RO water by 0.5 to 1.2, which helps minimize the fluctuations of your body's pH.
The minerals from the alkaline filter are natural calcium, magnesium, sodium, potassium ions, and others readily found in natural mineral water, which can be absorbed 100% by the human body. These ions are structurally smaller molecules which help the body take in more water and replenish lost water quickly. It also makes the water cleaner and healthier.Typically installed with RO systems to complement their absolute filtration quality.
Product Highlights
Fits most water filtration systems including RO systems, including name brand models.
What is included:
Specifications & Dimensions:
Why iSpring?
Located in Alpharetta, Georgia for over a decade, iSpring Water Systems LLC is a family owned company specializing in reverse osmosis water filtration systems. Our products include residential and commercial reverse osmosis (RO) systems, whole house water systems, ultrafiltration systems, shower, faucet, and counter top filters, filter cartridges and housings, RO coolers, and kitchen faucets and fittings. Our aim is to make high-quality drinking water accessible for all households. With affordable pricing, solid quality, prompt delivery, and top notch customer service, we hope to assist in bringing you great water for years to come.
- The RO membrane removes not only harmful pollutants but also a few helpful minerals. As a result, a standard 5 stage RO system produces slightly acidic water with a pH of 7. 0 or below. Alkaline mineral filter produces alkaline water with restored healthy minerals such as natural calcium, magnesium, and potassium ions, which ph.-balances the RO water
- Experience clean, safe, and good-tasting water every time you turn on the faucet
- The Alkaline filter can be added to any under-sink water filter or RO system
- Raises pH level
- Updated FA15 alkaline mineral filters are built with a secure push-fit quick connection, which allows faster filter replacement. If you have trouble installing the filters, please refer to the user manual or contact us
info:
We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it. Â
Specifications
Under-sink & countertop filtration system type
Under-Sink Filtration System
Filtration stages
3
Brand
iSpring
Features
Includes Mineral Stone and Calcite, Improves the taste of RO water by adding minerals, Raises pH by 0.5- 0.8, Can be added to any undersink water filter or RO system
Warranty
Warranty information
30 day warranty and lifetime tech support
Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.
Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.
Warnings
Similar items you might like
Based on what customers bought
AquaTru Classic Countertop Water Filter System Replacement Stage 3 Reverse Osmosis Filter, 3x3x10 in., 1-Pack $59.95
Sponsored$5995current price $59.95AquaTru Classic Countertop Water Filter System Replacement Stage 3 Reverse Osmosis Filter, 3x3x10 in., 1-Pack
764.7 out of 5 Stars. 76 reviewsSave withShipping, arrives tomorrowAQUA CREST 3US-AF01 Under Sink Water Filter, Replacement for Standard Filtrete® 3US-AF01, 3US-AS01, Aqua-Pure AP Easy C-CS-FF, WHCF-SRC, WHCF-SUFC, WHCF-SUF, NSF/ANSI 42 Certified, 5 Pack $52.99
Sponsored$5299current price $52.99AQUA CREST 3US-AF01 Under Sink Water Filter, Replacement for Standard Filtrete® 3US-AF01, 3US-AS01, Aqua-Pure AP Easy C-CS-FF, WHCF-SRC, WHCF-SUFC, WHCF-SUF, NSF/ANSI 42 Certified, 5 Pack
45 out of 5 Stars. 4 reviewsShipping, arrives in 3+ daysReplacement Pads - TEN PACK - For Mechanical Leak Detectors/Water Stop Valves - For Under Sink Reverse Osmosis and Water Filtration Systems (18mm) $10.00
$1000current price $10.00Replacement Pads - TEN PACK - For Mechanical Leak Detectors/Water Stop Valves - For Under Sink Reverse Osmosis and Water Filtration Systems (18mm)
15 out of 5 Stars. 1 reviewsiSpring MC7 1.8" x 12" 75GPD Reverse Osmosis RO Membrane Replacement Cartridge $36.99 $61.65/lb
$3699current price $36.99$61.65/lbiSpring MC7 1.8" x 12" 75GPD Reverse Osmosis RO Membrane Replacement Cartridge
13 out of 5 Stars. 1 reviewsWaterdrop Alkaline Water Filter WD-ALK35, Alkaline Filter for Reverse Osmosis System, pH Balance and Restore Minerals for RO Alkaline Filter, Under Sink Water Filter, 1/4" Quick Connect $29.99
$2999current price $29.99Waterdrop Alkaline Water Filter WD-ALK35, Alkaline Filter for Reverse Osmosis System, pH Balance and Restore Minerals for RO Alkaline Filter, Under Sink Water Filter, 1/4" Quick Connect
VonWater CT910/CT910H All-in-1 RO Filter, NSF/ANSI Certified Replacement for Reverse Osmosis System, 12-24 Months Water Filter Cartridge Replacement, Reduce TDS PFAS(CT910WF) $69.99
$6999current price $69.99VonWater CT910/CT910H All-in-1 RO Filter, NSF/ANSI Certified Replacement for Reverse Osmosis System, 12-24 Months Water Filter Cartridge Replacement, Reduce TDS PFAS(CT910WF)
iSpring US31 Under Sink Water System, NSF Certified 3-Stage Water Filters, Reduces PFAS, Chloramine, Chlorine and more, Tankless Water Filter System with Faucet $119.99
Sponsored$11999current price $119.99iSpring US31 Under Sink Water System, NSF Certified 3-Stage Water Filters, Reduces PFAS, Chloramine, Chlorine and more, Tankless Water Filter System with Faucet
364.9 out of 5 Stars. 36 reviewsShipping, arrives in 3+ days1-Year Compatible Filter Kit with Membrane for RainSoft 21179 Reverse Osmosis System $69.95
Sponsored$6995current price $69.951-Year Compatible Filter Kit with Membrane for RainSoft 21179 Reverse Osmosis System
11 out of 5 Stars. 1 reviewsShipping, arrives in 3+ daysWaterdrop Remineralization Filter WD-MNR35, RO Mineral Filter, 1/4" Quick Connect Mineral Filter For Reverse Osmosis System, Under Sink Water Filtration Restore Essential Minerals for RO System $33.99
$3399current price $33.99Waterdrop Remineralization Filter WD-MNR35, RO Mineral Filter, 1/4" Quick Connect Mineral Filter For Reverse Osmosis System, Under Sink Water Filtration Restore Essential Minerals for RO System
Waterdrop TSCT Under Sink Water Filter, Replacement for Waterdrop TSU-W, TSC 3-Stage Ultra-Filtration Under Sink Water Filter System, 2000 Gallons High Capacity. 1 Pack $36.99
$3699current price $36.99Waterdrop TSCT Under Sink Water Filter, Replacement for Waterdrop TSU-W, TSC 3-Stage Ultra-Filtration Under Sink Water Filter System, 2000 Gallons High Capacity. 1 Pack
15 out of 5 Stars. 1 reviews5 Stage Reverse Osmosis System Water Filter with 75GPD RO Membrane 5-Pack Set $28.99
$2899current price $28.995 Stage Reverse Osmosis System Water Filter with 75GPD RO Membrane 5-Pack Set
62.7 out of 5 Stars. 6 reviewsCulligan US-600A Under Sink Drinking Water Filter System - Includes D-20A Filter Cartridge $33.72
$3372current price $33.72Culligan US-600A Under Sink Drinking Water Filter System - Includes D-20A Filter Cartridge
523.9 out of 5 Stars. 52 reviewsSimPure 6-Stage Reverse Osmosis Under-Sink & Countertop Filtration System $53.99
Sponsored$5399current price $53.99SimPure 6-Stage Reverse Osmosis Under-Sink & Countertop Filtration System
93.7 out of 5 Stars. 9 reviewsShipping, arrives in 3+ daysUniversal 4-Stage Under Sink Reverse Osmosis Replacement Sediment Filter Kit $27.25
Sponsored$2725current price $27.25Universal 4-Stage Under Sink Reverse Osmosis Replacement Sediment Filter Kit
15 out of 5 Stars. 1 reviewsShipping, arrives in 3+ daysWaterdrop RF10W-UF 0.01 Micron Water Filter, NSF/ANSI 42 Certified, 8K Gallons High Capacity, Replacement for Waterdrop Under Sink Water Filtration System, White $29.99
$2999current price $29.99Waterdrop RF10W-UF 0.01 Micron Water Filter, NSF/ANSI 42 Certified, 8K Gallons High Capacity, Replacement for Waterdrop Under Sink Water Filtration System, White
35 out of 5 Stars. 3 reviewsWaterdrop WD-F2 Filter, Replacement for WD-X12 & WD-X16 Reverse Osmosis System, 6-month Lifetime $30.99
$3099current price $30.99Waterdrop WD-F2 Filter, Replacement for WD-X12 & WD-X16 Reverse Osmosis System, 6-month Lifetime
Puredrop FUC15S Replacement Filter Cartridge for UC15S Water Filter Under Sink, 10K Gallons Capacity, Replacement Filter $24.99
$2499current price $24.99Puredrop FUC15S Replacement Filter Cartridge for UC15S Water Filter Under Sink, 10K Gallons Capacity, Replacement Filter
12 out of 5 Stars. 1 reviewsReplacement Pads - TEN PACK - For Mechanical Leak Detectors/Water Stop Valves - For Under Sink Reverse Osmosis and Water Filtration Systems (20mm) $10.00
$1000current price $10.00Replacement Pads - TEN PACK - For Mechanical Leak Detectors/Water Stop Valves - For Under Sink Reverse Osmosis and Water Filtration Systems (20mm)
15 out of 5 Stars. 1 reviewsAQUA CREST 3US-AF01 Under Sink Water Filter, Replacement for Standard Filtrete® 3US-AF01, 3US-AS01, Aqua-Pure AP Easy C-CS-FF, WHCF-SRC, WHCF-SUFC, WHCF-SUF Water Filter, 4 Pack $37.99 Was $42.99
SponsoredNow$3799current price Now $37.99, Was $42.99$42.99You save $5.00You save$5.00AQUA CREST 3US-AF01 Under Sink Water Filter, Replacement for Standard Filtrete® 3US-AF01, 3US-AS01, Aqua-Pure AP Easy C-CS-FF, WHCF-SRC, WHCF-SUFC, WHCF-SUF Water Filter, 4 Pack
65 out of 5 Stars. 6 reviewsShipping, arrives in 3+ daysClip for Filters or Membrane Housings on Reverse Osmosis & Water Filter Systems $14.99
Sponsored$1499current price $14.99Clip for Filters or Membrane Housings on Reverse Osmosis & Water Filter Systems
Shipping, arrives in 3+ days
Check out these related products
Alkaline Replacement Water Filter Cartridge, 10-inch Inline Quick Connect 3-Layer with Mineral balls, Calcite, and Corosex for Reverse Osmosis RO Systems $27.99
$2799current price $27.99Alkaline Replacement Water Filter Cartridge, 10-inch Inline Quick Connect 3-Layer with Mineral balls, Calcite, and Corosex for Reverse Osmosis RO Systems
15 out of 5 Stars. 1 reviewsiSpring F9K 1-Year Reverse Osmosis Water Filter Replacement Cartridge Pack Set for 6-Stage Alkaline Mineral RO Filtration Systems, Without Membrane, White $69.24
$6924current price $69.24iSpring F9K 1-Year Reverse Osmosis Water Filter Replacement Cartridge Pack Set for 6-Stage Alkaline Mineral RO Filtration Systems, Without Membrane, White
194.9 out of 5 Stars. 19 reviewsPremier 6 Stage- Inline Alkaline | KDF | Mineral pH Balancing Drinking Water Filter | 2"x 10" - Replacement $45.49
$4549current price $45.49Premier 6 Stage- Inline Alkaline | KDF | Mineral pH Balancing Drinking Water Filter | 2"x 10" - Replacement
IonTech ACF-1 Activated Carbon Fiber Alkaline Water Ionizer Replacement Filter $89.00
$8900current price $89.00IonTech ACF-1 Activated Carbon Fiber Alkaline Water Ionizer Replacement Filter
15 out of 5 Stars. 1 reviewsiSpring F19K75 2-Year Replacement Supply Set for 6-Stage Reverse Osmosis RO Water Filtration Systems with Alkaline Mineral Filter, 19 Count (Pack of 1), White $139.99
$13999current price $139.99iSpring F19K75 2-Year Replacement Supply Set for 6-Stage Reverse Osmosis RO Water Filtration Systems with Alkaline Mineral Filter, 19 Count (Pack of 1), White
55 out of 5 Stars. 5 reviewsPREMIER 6 Stage- Inline Alkaline | KDF | Mineral pH Balancing Drinking Water Filter | 2"x 10" $49.24
$4924current price $49.24PREMIER 6 Stage- Inline Alkaline | KDF | Mineral pH Balancing Drinking Water Filter | 2"x 10"
25 out of 5 Stars. 2 reviews3M Filtrete Under-Sink Advanced Replacement Water Filter $64.95
$6495current price $64.953M Filtrete Under-Sink Advanced Replacement Water Filter
2554.6 out of 5 Stars. 255 reviews1 Year Elite RO Alkaline Reverse Osmosis System Replacement Filter Set ? 5 Easy Change Quick Twist filters with Alkaline Filter for added Essential Minerals ? 100 GPD RO Membrane $119.99
$11999current price $119.991 Year Elite RO Alkaline Reverse Osmosis System Replacement Filter Set ? 5 Easy Change Quick Twist filters with Alkaline Filter for added Essential Minerals ? 100 GPD RO Membrane
124.6 out of 5 Stars. 12 reviews
Customer ratings & reviews
How item rating is calculated
Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.
Sort by |
Showing 1-3 of 8 reviews
Feb 6, 2026
Judy
5 out of 5 stars review
Verified Purchase
This is the 2nd alkaline filter for us. We mark the date installed on the housing so we know when to replace. We use this filter to make our water alkaline because so much of today's foods cause an acidic body environment. It works well for us. it is easy for my husband to install under our kitchen sink. we have it going to a separate stainless steel tap.
Helpful?5CRAKCJMFZNP110622234
Nov 15, 2025
Paul
5 out of 5 stars review
Verified Purchase
filtering and adding alkalinity two birds with one stone highly recommended
Helpful?5CRAKCJMFZNP110622234
Aug 13, 2023
jason
5 out of 5 stars review
Verified Purchase
Happy with it
Good filter improved the taste
Helpful?5CRAKCJMFZNP110622234
