COSLUS C31 Water Flosser
By COSLUS · Water Flossers · Health & Lifestyle · More from COSLUS
- 4 age-based cleaning modes
- 30-90 PSI water pressure
- 150 mL water tank
- 800 mAh rechargeable battery
- up to 30 days per charge
Price not listed
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- eBayView at eBay
- AmazonView at Amazon (paid link)
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Summary
A cordless, rechargeable water flosser aimed at children aged 6 and up, with four age-based modes and an orthodontic tip for braces. It is a kids’ unit at heart, so confirm the tank capacity with the seller before buying: the official page states both 150 mL and 300 mL.
Strengths
- Age-based modes let a child start at the gentle 30 PSI end instead of an adult pressure.
- The orthodontic tip targets braces, a gap most kids’ flossers leave open.
- A light 201 g body and a compact tank suit small hands.
- COSLUS lists it at $42.99 on its own store with a 2-year limited warranty, 30-day returns and free shipping.
- COSLUS claims up to 30 days per charge, so it does not need a nightly top-up.
Weaknesses
- No independent, instrumented test of the C31 exists; pressure, noise, battery life and tank capacity are all manufacturer claims.
- The official page contradicts itself on the core spec: the listing says a 150 mL tank while a FAQ answer says 300 mL.
- The 5 V charging adapter is not in the box, so a buyer without a spare phone adapter has to buy one.
- No ADA acceptance, unlike some adult COSLUS models.
- No replacement battery, pump or seals are sold, so repair after the 2-year warranty is undocumented.
- There is essentially no exact-model owner community to confirm long-term durability.
Verified specifications
| Model | C31, sold as the COSLUS C31 Age-Specific Cordless Water Flosser for Kids. |
|---|---|
| Type | cordless, rechargeable handheld oral irrigator. |
| Target user | children aged 6 and up. |
| Cleaning modes | four — 6–9 Years, 10–12 Years, 12+ Years and Massage. |
| Pressure range | 30–90 PSI (manufacturer-stated). |
| Water tank | 150 mL in the listing; a FAQ answer on the same page also says 300 mL. |
| Battery | internal 800 mAh rechargeable; COSLUS claims up to 30 days per charge and about 2.17 hours to recharge. |
| Noise | under 65 dB (manufacturer-stated). |
| Weight | 201 g (body). |
| Tips | two — one standard jet tip and one orthodontic tip. |
| Charging | through the body’s 8-shaped port; the wall adapter is not included. |
| Colors | Light Pink, Blue and Lake Blue. |
| Warranty | 2-year limited warranty, with 30-day returns and free shipping from the official store. |
| In the box | flosser, standard jet tip, orthodontic tip, extended-warranty card and instruction manual. |
| ADA acceptance | not claimed for the C31. |
Full research notes and sources
Cleaning modes and pressure
The C31 trades a single power setting for four modes labelled by age: 6–9 Years, 10–12 Years, 12+ Years and Massage. The range runs 30–90 PSI, and the low end is the point of the device. A young child can start on a gentle spray for sensitive gums, while the top end stays below what an adult countertop unit delivers. Those figures are manufacturer-stated; nobody has published an independent pressure measurement at the tip.
Tank, battery and charging
The tank is listed at 150 mL, a compact size that fits the 201 g body. A FAQ answer on the same product page claims a “super-large capacity of 300ml”, which duplicates the copy used for the larger C20, C30 and E40 models; treat 150 mL as the C31 figure and confirm with the seller if capacity matters. A genuine 150 mL tank is small and may need a refill during a session on the higher modes.
The internal battery is 800 mAh, and COSLUS claims up to 30 days per charge and about 2.17 hours to recharge. It charges through an 8-shaped port, and the wall adapter is not included; COSLUS says any standard 5 V phone or tablet adapter works. There is no USB-C port on this model.
Tips, upkeep and running costs
COSLUS advises replacing the nozzle tips every 3 months and sells replacement tips, a matching charging cable and a power adapter as accessories. No internal part — battery, pump or seals — is sold separately, so a failed unit is a warranty matter rather than a repair. There is no subscription, proprietary liquid or consumable cartridge; the only running cost is tips and, if you need one, a 5 V adapter.
Is it worth it?
At the $42.99 COSLUS charges on its official store, the C31 is a fair price for a child’s first irrigator or a braces-care tool, and the 2-year limited warranty and 30-day returns matter when the data is thin. What the buyer is really paying for is the age-based design and the orthodontic tip; the performance numbers behind it are manufacturer claims rather than measured results. If a true 300 mL tank is the deciding feature, confirm it with the seller first, because the official page gives two different capacities.
Which model this is
This page covers the COSLUS C31 kids’ water flosser, sold in Light Pink, Blue and Lake Blue under the manufacturer’s children’s-flosser page.
The US Amazon listing for this model is ASIN B0BYSPY3ZJ.
Do not confuse the C31 with the COSLUS C20, C30, C50, C51, E40 or T40, which are separate models with different tanks, modes and pressure systems. A single official instruction manual exists under the C31 name.
Sources
Manufacturer:
- COSLUS C31 Age-Specific Cordless Water Flosser for Kids
- COSLUS C31 instruction manual (PDF)
- COSLUS warranty
- COSLUS user guide
- COSLUS water flossers collection and model comparison
Independent reviews:
- Is the COSLUS Flosser Worth Buying? Here’s My Honest Review After Use
- No independent or instrumented test of the exact C31 was found.
Owner reports:
- No exact-model C31 owner community data was reachable.
