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Hydrofast
Hydrofast B100 Countertop Reverse Osmosis Purifier

Hydrofast B100 Countertop Reverse Osmosis Purifier

4.1(36 ratings)

Best price now

$189.98at WalmartObserved at 7:06 AM

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Our take on the Hydrofast B100 Countertop Reverse Osmosis Purifier

The Hydrofast B100 is a countertop reverse osmosis purifier with six filtration stages. It needs no plumbing: fill the tank, plug it in, and it pushes filtered water through an RO membrane. It measures 12 x 11 x 15 inches, so it takes real counter space. At $189.98 at Walmart as of November 6, 2026, it is the lowest new price among the two stores listing it.

Best forRenters who can't install an under-sink systemApartments and small kitchensPeople who want RO water without plumbing workHouseholds that fill a tank rather than plumb a line
Pros
  • Six filtration stages, including a reverse osmosis membrane
  • No plumbing or installation: fill the tank and plug it in
  • Countertop format suits rentals and small kitchens
  • Low entry price for an RO purifier at $189.98 at Walmart as of November 6, 2026
Cons
  • Takes up counter space at 12 x 11 x 15 inches
  • Tank must be refilled by hand; output is limited by tank size
  • Slower than a plumbed under-sink RO system
  • Replacement filters add ongoing cost

Hydrofast B100 Countertop Reverse Osmosis Purifier prices at every store

  • WalmartNew

    In stockSold by GEEK FLASH

    $189.98Observed at 7:06 AM
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Also available at

  • eBayCheck price at eBay

Hydrofast B100 Countertop Reverse Osmosis Purifier price history

Lowest price we've seen: $189.98 on Nov 6 at Walmart. Tracked across 1 store since Nov 6.

What reviewers say

  • 4.1 / 536 ratings

Buyers rate it 4.1 out of 5 from 36 ratings, so most are satisfied but not unanimous. Complaints center on speed and the need to refill the tank.

What people mention
  • SetupPraisedOwners say it works out of the box with no plumbing.
  • TastePraisedBuyers report the water tastes cleaner than tap.
  • SpeedCriticisedFiltration and refilling are slow, especially when the tank empties.
  • CapacityMixedThe tank suits one or two people but needs frequent refills in bigger homes.
  • Counter spaceMixedIt fits on a counter but takes a sizable footprint.

Specifications

Filtration Stages
6
Dimensions
12.00 x 11.00 x 15.00 in
Rec. Use
Residential
Color Type
White

Questions and answers

Does the Hydrofast B100 need plumbing?
No. It is a countertop unit: fill the tank and plug it in. No under-sink connection is required.
How much counter space does it take?
It measures 12 x 11 x 15 inches, so plan for about a foot of depth and width plus clearance to open and fill the tank.
Is $189.98 a good price?
It is the lowest new price among the two stores listing it as of November 6, 2026. Whether it is a good deal depends on how it compares with its own past prices.
How often do filters need replacing?
Replacement intervals depend on use and water quality. Budget for filter and membrane replacements as an ongoing cost.
Is it good for a family?
It suits one or two people best. Larger households will refill the tank often because output is limited by tank size.
Where is the Hydrofast B100 Countertop Reverse Osmosis Purifier cheapest?
At Walmart, for $189.98, as of our latest check.
What do buyers say about the Hydrofast B100 Countertop Reverse Osmosis Purifier?
Rated 4.1 out of 5 from 36 ratings.
Where can I buy the Hydrofast B100 Countertop Reverse Osmosis Purifier?
2 stores we checked sell it, including Walmart, eBay.