Countertop Water Filters
Best Alkaline Countertop Water Filter (2026): Top 5 by the Specs
As an Amazon Associate we earn from qualifying purchases. Specs below come from each product's Amazon listing; we do not test products in person.
For an alkaline countertop water filter, the APEX 5-stage filter leads this list: it connects to standard faucets, filters up to 750 gallons, and carries a 1-year warranty. If you want the most filter stages, the 10-stage Anchor filters up to 1500 gallons.
Starting out? See the main guide: Best Countertop Water Filter
Top picks at a glance
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Best OverallExprt APEX MR-1050 Countertop Water Filter9.8 View on Amazon -
Most Filter StagesAnchor AF-3110 10-Stage Alkaline9.7 View on Amazon -
Also GreatNU Aqua Countertop Water Filter System9.5 View on Amazon -
9.3 View on Amazon -
9.2 View on Amazon
Compare the specs
Ranked on filtration stages, filter life from each listing, plus how many buyers have rated it. A dash (—) means we could not confirm that figure from the listing.
| Pick | Filtration stages | Filter life | Weight | Warranty |
|---|---|---|---|---|
| 1. Exprt APEX MR-1050 Countertop Water Filter | 5 stages | 750 gal | — | 1-year |
| 2. Anchor AF-3110 10-Stage Alkaline | 10 stages | 1,500 gal | 5.2 lb | — |
| 3. NU Aqua Countertop Water Filter System | 8 stages | — | 5 lb | 1-year |
| 4. SimPure Y9A UV Countertop Reverse Osmosis Water | 6 stages | — | 16.5 lb | — |
| 5. AquaTru Glass Carafe Smart Alkaline Countertop RO | 4 stages | — | 14.15 lb | 1-year |
Exprt APEX MR-1050 Countertop Water Filter
Its 5-stage alkaline filtration connects to standard faucets, filters up to 750 gallons, and carries a 1-year warranty.
- Filtration stages: 5 stages
- Filter life: 750 gal
- 1-year warranty stated
Good for
- Buyers who want 5-stage faucet filtration
- Buyers who want a 1-year warranty
Skip it if
- You need a filter life past 750 gallons
- You need more than 5 stages
It uses 5-stage alkaline filtration with coconut shell carbon, KDF-55 and mineral beads with calcite, and reduces up to 99% of chlorine. It connects to most standard kitchen faucets with a diverter valve and 4 faucet adapters. It filters up to 750 gallons at a maximum flow of 1 gpm and carries a 1-year warranty.
Anchor AF-3110 10-Stage Alkaline
Its 10-stage alkaline filtration adds minerals with KDF-55, coconut carbon and mineral stones across 1500 gallons.
- Filtration stages: 10 stages, the most here
- Filter life: 1,500 gal
Good for
- Buyers who want 10 filtration stages
- Buyers who want a 1500-gallon filter life
Skip it if
- You need a filter under 5.2 lb
- You need more than 10 stages
It uses 10-stage alkaline filtration with KDF-55, coconut shell activated carbon, mineral stones, calcite and ORP balls. It filters up to 1500 gallons at a maximum flow of 1 gpm and weighs 5.2 lb. The filter cartridge is replaced every 6 months.
NU Aqua Countertop Water Filter System
Its 8-stage alkaline filtration fits sinks with removable aerators and carries a 1-year warranty with a 120-day trial.
- Filtration stages: 8 stages
- 1-year warranty stated
Good for
- Buyers who want 8-stage filtration
- Buyers who want a 120-day trial
Skip it if
- You need a warranty longer than 1 year
- You need a filter for spray-type faucets
It uses 8-stage alkaline filtration with activated coconut carbon and installs in 30 seconds on sinks with removable aerators. Filter replacements are needed every 6-9 months, and the system carries a 1-year warranty with a 120-day trial. It weighs 5 lb.
SimPure Y9A UV Countertop Reverse Osmosis Water
Its 6-stage RO filtration adds minerals after reverse osmosis and produces 300 gallons per day with no plumbing.
- Filtration stages: 6 stages
Good for
- Buyers who want RO filtration with remineralization
- Buyers who want 300 gallons per day
Skip it if
- You need a filter under 16.5 lb
- You need a filter that needs no outlet
It uses 6-stage reverse osmosis filtration with a post-mineralization filter that adds calcium, magnesium and potassium. It produces 300 gallons per day, needs no plumbing, and uses a side-mounted tank that refills without moving the unit. It measures 14 x 9.3 x 14.3 inches, needs 18 inches of vertical clearance, and weighs 16.5 lb.
AquaTru Glass Carafe Smart Alkaline Countertop RO
Its 4-stage RO filtration adds minerals with a glass carafe, WiFi app tracking and a 1-year warranty.
- Filtration stages: 4 stages
- 1-year warranty stated
Good for
- Buyers who want a glass carafe
- Buyers who want WiFi filter-life tracking
Skip it if
- You need a filter under 14.15 lb
- You need a warranty longer than 1 year
It uses 4-stage reverse osmosis filtration with an alkaline mineral boost filter and a removable glass carafe. The WiFi app tracks filter life, and the filters last 6 months or 300 gallons for pre/carbon, 1 year or 600 gallons for RO, and 1 year or 300 gallons for VOC carbon. It weighs 14.15 lb and carries a 1-year warranty.
How to choose
Stages and media
Stages count the layers water passes through, and media is what each layer uses. The APEX has 5 stages, the AquaTru has 4, the SimPure has 6, the NU Aqua has 8, and the Anchor has 10. The APEX and Anchor filters use coconut carbon, KDF-55 and calcite, and the Anchor adds mineral stones. Compare stage counts and media before choosing.
Filter life in gallons
Filter life in gallons is how much water a filter treats before replacement. The APEX filters up to 750 gallons, and the Anchor filters up to 1500 gallons. The AquaTru pre/carbon filter lasts 6 months or 300 gallons, its RO filter lasts 1 year or 600 gallons, and its VOC carbon filter lasts 1 year or 300 gallons. The NU Aqua filters are replaced every 6-9 months, the SimPure PPC/ALK filters every 6 months, and its RO filter every 9 months. Compare gallon figures where given, and months where gallons are not given.
Faucet connection versus tank systems
A faucet filter connects to a tap, while other countertop systems hold water in a tank or carafe. The APEX and Anchor filters connect to kitchen faucets, and the NU Aqua fits sinks with removable aerators. The SimPure uses a side-mounted tank, and the AquaTru uses a removable glass carafe. Choose a faucet filter for filtration at the tap, and a tank or carafe system for a countertop unit without a faucet connection.
FAQ
Which filter has the most stages?
The Anchor filter has 10 stages, followed by the NU Aqua with 8 stages and the SimPure with 6 stages.
How long do these filters last in gallons?
The APEX filters up to 750 gallons, and the Anchor filters up to 1500 gallons. The AquaTru RO filter lasts 1 year or 600 gallons.
Does the SimPure system need plumbing?
No. The SimPure system needs no plumbing: place it on a countertop, fill the side-mounted tank, and connect it to a standard electrical outlet.
Which filter has a glass carafe?
The AquaTru system includes a removable glass carafe with a lid, plus a complete 4-stage filtration set.
