COSLUS Black F5020E Cordless Water Flosser, 300 ml

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Product guide

COSLUS Black F5020E Cordless Water Flosser, 300 ml

The COSLUS Black F5020E is a cordless water flosser with a listed 300 ml tank and five replacement tips. Its rechargeable design is aimed at home and travel use; the listing claims up to 30 days of battery life, but does not specify the usage conditions behind that figure.

At a glance

A 300 ml detachable tank is described as sufficient for one cleaning, with a wide opening for filling and cleaning.
Four pressure modes include Soft and Massage options; the listing advises newcomers to start at a low setting.
Five replacement tips and a rotatable nozzle are claimed, with braces and travel use mentioned as intended scenarios.
The maker claims up to 30 days of use after a full charge, with a stated charging time of 3 hours.

Price

£19.99Save 15%

Reference price: ~~£23.59~~

Price checked: 11 Nov 2026

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Pros and cons

Pros

The 300 ml tank may reduce refill interruptions during a cleaning session.
Four stated modes provide a low-pressure option for users who want to ease into water flossing.
Cordless rechargeable operation and the claimed 30-day battery life suit buyers seeking a travel-friendly routine.

Technical specifications

11 specifications

Identity
Brand	COSLUS
Model	COSLUS Black F5020E

Power and battery
Power configuration	Battery Powered

Dimensions and installation
Dimensions listed	31 x 6.9 x 5.5 centimetres
Weight listed	442 Grams

Cleaning and capacity
Tank volume	300 Millilitres
Pressure modes	4 pressure modes: Clean/Soft/CH/Massage Modes
Jet tips	5 replacement jet tips
Waterproof rating	IPX7

Charging and use
Charging time	3 hours
Battery life claim	up to 30 days of use

What to know before buying

The product description claims five replacement heads and an IPX7 rating, but package contents and the rating are not independently confirmed; the maker says shower use is suitable only when the charging-port cover is tightly closed. Its battery-duration, quietness and durability statements are manufacturer claims without stated usage conditions.

Who is it for?

A good fit for

People seeking a cordless water flosser with a larger stated tank for home or travel.
Users with braces or those who prefer multiple pressure modes, including a Soft setting.
Buyers wanting several replacement tips in the claimed kit.

Less suited to

Buyers who need a verified battery runtime under a specified daily-use schedule.
Anyone who needs a confirmed package inventory or independently established waterproof rating before purchase.

COSLUS Black F5020E Cordless Water Flosser, 300 ml · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 49,279 ratings

5 stars62%62%
4 stars20%20%
3 stars9%9%
2 stars3%3%
1 star6%6%

Customer feedback is broadly favourable: the supplied summary reports that buyers find cleaning effective and the flosser easy to use, and mentions positive impressions of battery life and charging. It also reports mixed durability experiences, including some units breaking after short use. The aggregate rating is 4.3 out of 5 from 49,279 ratings; that broad rating does not establish how long a particular unit will last or explain individual experiences.

Positive themes

The customer summary reports that users find it effective and easy to use, with positive comments on battery life and charging.

Negative themes

The customer summary includes reports of the flosser breaking after short use.

Mixed feedback

Durability feedback is mixed: the summary contrasts reports of long-lasting use with reports of early breakage.

Frequently asked questions

How many pressure modes does the listing specify?

It describes four modes: Clean, Soft, CH and Massage. It recommends beginning on a low setting, particularly for novices.

What is the stated tank capacity?

The listing specifies a 300 Millilitres tank and says it is enough for a single cleaning.

What comes in the claimed package?

The product description claims one flosser, five replacement heads, a user manual and a charging cable; it explicitly says an adapter is not included.

Can it be used in the shower?

The maker claims IPX7 waterproofing and says shower use is suitable after the charging-port cover is tightly closed; this claim is not independently verified.