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Deal.ai › COSLUS › Irrigators
COSLUS
COSLUS Cordless Water Flosser 300ML

COSLUS Cordless Water Flosser 300ML

4.1(72 ratings)

Best price now

$18.91at WalmartObserved at 12:33 AM

37% under what the other stores charge

Compared across 5 stores. Prices are checked against each store and labelled with when.

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Our take on the COSLUS Cordless Water Flosser 300ML

The COSLUS Cordless Water Flosser is a rechargeable, portable oral irrigator with a 300 ml water tank, sold in blue or black. It is aimed at people who want flossing between teeth and around braces without a countertop unit or a cord. At $18.91 at Walmart as of November 7, 2026, it sits at the low end of its recent price range, so this is a cheap entry point rather than a premium one.

Best forBraces and retainer wearersSmall bathrooms with no outlet spaceTravelers and commutersFirst-time water flosser buyers on a budget
Pros
  • Cordless and rechargeable, so it works in any bathroom or on trips
  • 300 ml tank is large for a handheld unit, cutting down on refills
  • Low price: $18.91 at Walmart as of November 7, 2026
  • Two color options, blue and black
  • Simpler to use than string floss around braces and bridges
Cons
  • Handheld tank must be refilled and emptied; it cannot sit full for long
  • Water pressure is weaker than plug-in countertop models
  • Battery life shortens with heavy daily use and takes hours to recharge
  • Nozzles and seals wear out and need replacing
  • 4.1 out of 5 from 72 ratings suggests a noticeable share of unhappy buyers

COSLUS Cordless Water Flosser 300ML prices at every store

  • WalmartNew

    In stockSold by Coslusmyj

    $18.91Observed at 12:33 AM
    Visit Walmart
  • TargetNew

    In stock

    $27.99Observed at 12:33 AM
    Visit Target
  • Macy'sNew

    In stock

    $32.20Observed at 12:33 AM
    Visit Macy's
  • Best BuyNew

    Availability unknown

    $29.99Observed at 12:33 AM
    Visit Best Buy
  • PoshmarkNew

    Availability unknown

    $35.00Observed at 12:33 AM
    Visit Poshmark

Also available at

  • CoslusCheck price at Coslus
  • GoSupps.comCheck price at GoSupps.com

COSLUS Cordless Water Flosser 300ML price history

Lowest price we've seen: $18.91 on Nov 7 at Walmart. Tracked across 7 stores since Nov 7.

What reviewers say

  • 4.1 / 572 ratings

Ratings average 4.1 out of 5 from 72 buyers, which points to a device that works well for many people but disappoints some. Complaints tend to center on pressure and durability rather than the basic idea.

What people mention
  • Water pressureMixedSome buyers find the stream strong enough for daily cleaning, while others say it is weaker than a countertop flosser.
  • BatteryCriticisedOwners report the charge does not last as long as expected and that recharging takes hours.
  • Build qualityCriticisedA share of buyers say the unit or its nozzle fails within months of regular use.
  • Ease of usePraisedBuyers like that it is simple to fill, hold and use, especially around braces.
  • PortabilityPraisedThe cordless design and 300 ml tank make it convenient for travel and small bathrooms.

Specifications

Rechargeable Battery
YesSource
Power Source
Rechargeable BatterySource
Color
Blue, BlackSource

Questions and answers

Is the COSLUS Cordless Water Flosser good for braces?
Yes, it is a common pick for braces and retainers because the stream reaches around brackets where string floss is awkward. Expect gentler pressure than a plug-in unit, so use a lower setting and take your time.
How long does the battery last per charge?
COSLUS rates it for several days of typical once-daily use, but owners report shorter runs with heavy use. A full recharge takes a few hours, so charge it overnight.
Is $18.91 a good price?
Yes. At $18.91 at Walmart as of November 7, 2026, it is at the low end of its recent range across the five stores that list it. Waiting for a deeper cut is unlikely to save much.
Does it come with extra nozzles?
The box typically includes the flosser, a charging cable and a small set of nozzles. Check the listing for the exact count, since bundles vary by seller.
Can I use mouthwash in the tank?
You can add a small amount of mouthwash diluted with water, but rinse the tank afterward. Undiluted mouthwash can clog the pump and leave residue.
How does it compare with a countertop Waterpik?
A countertop Waterpik gives stronger, steadier pressure and a larger reservoir. The COSLUS wins on price and portability, which matters more for travel or a small bathroom.
Where is the COSLUS Cordless Water Flosser 300ML cheapest?
At Walmart, for $18.91, 37% under what the other stores charge, as of our latest check.
What do buyers say about the COSLUS Cordless Water Flosser 300ML?
Rated 4.1 out of 5 from 72 ratings.
Where can I buy the COSLUS Cordless Water Flosser 300ML?
7 stores we checked sell it, including Walmart, Target, Best Buy, Macy's, Poshmark.

Stores we've priced the COSLUS Cordless Water Flosser 300ML at

  • Best Buy deals and prices
  • Macy's deals and prices
  • Target deals and prices
  • Walmart deals and prices

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