# 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.

- [Product page](https://bargainpostbox.co.uk/product/coslus-black-f5020e-cordless-water-flosser)
- [View offer](https://bargainpostbox.co.uk/visit/coslus-black-f5020e-cordless-water-flosser)
- Market: US
- Language: en-US
- Currency: USD
- Brand: COSLUS
- Model: COSLUS Black F5020E
- Category: Beauty & Health > Personal Care Appliances > Electric Toothbrushes
- Price: 19.99 USD
- Previous price: 23.59 USD
- Discount: 15%
- Price checked: 2026-11-11T13:52:44.817Z
- Rating: 4.3 / 5
- Ratings: 49279

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## 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.

## 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.

## 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

## Before you buy

- 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.

## 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.

## Customer feedback

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: The customer summary reports that users find it effective and easy to use, with positive comments on battery life and charging.
- Negative: The customer summary includes reports of the flosser breaking after short use.
- Mixed: 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.

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## Images

![COSLUS Black F5020E Cordless Water Flosser, 300 ml — 1](https://bargainpostbox.co.uk/i/XEw164ka8UaV6EVAtPcs-5n-NPz8I4k73jE4CBPGn44eQaBdPQCfW8jz0sPau_NMZ9tel0L7SUWop9xJMbv4itXCesQqYU60YtqZmhWMhPKBXmbrHX6rbFfw.jpg)

![COSLUS Black F5020E Cordless Water Flosser, 300 ml — 2](https://bargainpostbox.co.uk/i/XF7Jz5-m2OH7YSbxHGhxTrI_3-nOaz9x6uGMFyY7IjHIhbEfzErFp1dFrrBQO-jnVV_V3gSAe7wxhz8FwFTmMKIqkY-XSt0CfJUpm0HoyuAeSqkmLTZ39dkL.jpg)

![COSLUS Black F5020E Cordless Water Flosser, 300 ml — 3](https://bargainpostbox.co.uk/i/nAeO0OpKZVVkHdUI6kZ2axWR2yjhJHPIgHXGGsWJCcUD7K1TRNlZKpB5QSUR560C9cRCCxVWJD8dI5_l8t1n2SO8776uMbXYiGIJU3azOyAWediuvQRggXYj.jpg)

![COSLUS Black F5020E Cordless Water Flosser, 300 ml — 4](https://bargainpostbox.co.uk/i/D-g03MXoEhaud8X4WUlT9H6iQG8sZp9X4bcqi7FYvUnfnLHLwohWg60QV1ZAaJcSa6WDTt5ESBpCGLCNyESKQ2NTAIEdxnTINZ8RjepY4pM6bNy7sYn-pPtG.jpg)

![COSLUS Black F5020E Cordless Water Flosser, 300 ml — 5](https://bargainpostbox.co.uk/i/gfwYHOghKWsOCkjSAOP0Ex0zNLaILAKZwulDwHSQRCQAWUE_IAxRJeWdaRMIhDHn2-4APteUlvo_Qscg7blGIAzMYqHjRuEF48DWEn6Hgc-p3iOEVevrlb2u.jpg)

![COSLUS Black F5020E Cordless Water Flosser, 300 ml — 6](https://bargainpostbox.co.uk/i/H2BndW7oCGQu6aHpKl5Vc-DN9mTu4Tjmim-oIE132xPHFPV1fR-mCFFxGkOVwZKpNiALQICJOugGwagrjnrZKOUyBnrOtKi2TWw1ku0lvQFeeYxk0Ydudyd_.jpg)

![COSLUS Black F5020E Cordless Water Flosser, 300 ml — 7](https://bargainpostbox.co.uk/i/QbzdmGKjFh3lNFryA_iA8NGVXIYnsuVDHDAhL2dW_cZHZSO59_KJ3XXJlU2vdZDnyooslfxszRV9i0SaNAFWGTb8fjAjqs5MrFmGHdcZqjuORFQjGDfVNXEi.jpg)