COSLUS C30

COSLUS C30

By COSLUS · Water Flossers · Health & Lifestyle

  • DIY mode

Lowest price seen
$7.35
from $7.35 at Luscent (COSLUS Store, luscent.shop) · Checked Oct 2, 2026

Prices are snapshots. Check the current price with the store.

Problems, parts and running costs

Summary

A budget cordless oral irrigator with a 300 mL removable tank, Normal/Soft/Pulse modes plus an 8-step DIY setting, memory and four tips. Check before buying: the battery is not replaceable, and the branded pressure and charge specs are not confirmed by the official manual.

Strengths

  • Normal/Soft/Pulse plus an 8-step DIY setting and memory give more control than most budget flossers with fixed modes.
  • A 300 mL wide-mouth tank handles a full session and is easy to empty and dry.
  • Owners repeatedly report strong cleaning force.
  • Owners and seller copy point to many uses between charges.
  • A strong set of features for the money in a low price band.
  • A 2-year warranty is competitive for the budget tier.

Weaknesses

  • The lithium battery is not user-replaceable, which limits the practical lifespan.
  • Replacement tips cost $15.99, high next to the device price, and the manual says replace them every 6 months.
  • Charging and runtime specs conflict: the manual says 4 hours and 40-120 minutes, while seller copy claims 3 hours and about 60 uses.
  • The pressure and pulse figures are unconfirmed: retail copy claims 30-150 PSI, while the official manual omits them and the OEM maker lists 21-119 PSI.
  • Long-term durability is unverified, and one exact-model review reports a malfunction after a few months.
  • New users report sink and mirror spray while learning, and the controls can be pressed accidentally.

Verified specifications

ModelC30; manufacturer model FC5360.
Reservoir300 mL, removable wide-mouth tank.
Water resistanceIPX7.
ModesNormal, Soft, Pulse and DIY, with 8 DIY gears and a memory function.
Electrical3.7 V; charging 5 V/1 A (manual maximum 2 A).
Charging and runtimethe official manual says a 4-hour charge and 40-120 minutes of runtime; seller copy claims 3 hours and about 60 uses or up to 30 days.
Auto-off120 seconds.
Batteryinternal rechargeable lithium, non-replaceable per the manual.
Tipstwo standard, one orthodontic and one tongue scraper; replace every 6 months.
Pressure and pulsesretail copy claims 30-150 PSI and 1,400-1,800 pulses per minute, but the official manual omits both, and the OEM maker lists 21-119 PSI and 1,250 ±20%.
Dimensions9.53 × 3.46 × 3.03 in and 15.17 oz per COSLUS; older FC5360 listings give 8.71 × 3.29 × 2.81 in and 14.89-15.04 oz.
In the boxirrigator, four tips, charging cable and manual; the current page also lists a warranty card. No AC adapter.
Warranty2-year warranty and 30-day money-back.
Full research notes and sources

Control and tank for the money

The C30 puts unusual control into a budget cordless flosser. Normal, Soft and Pulse are joined by an 8-step DIY setting and a memory function, which is more adjustment than most budget units with fixed modes. The 300 mL wide-mouth tank covers a typical session and is easy to empty and dry, and the handle is IPX7. Four tips are included: two standard, one orthodontic and one tongue scraper.

Specs that do not line up

The official manual and seller copy disagree in two places. The manual says a 4-hour charge and 40-120 minutes of runtime; seller copy claims 3 hours and about 60 uses or up to 30 days. The branded pressure and pulse figures are also unconfirmed: retail copy advertises 30-150 PSI and 1,400-1,800 pulses per minute, while the official manual omits both and the OEM maker lists 21-119 PSI and 1,250 ±20%. Size and weight differ too, with current COSLUS figures at 9.53 × 3.46 × 3.03 in and 15.17 oz against older listings at 8.71 × 3.29 × 2.81 in and 14.89-15.04 oz. Without a documented revision, those gaps stay open, so treat the branded numbers as claims.

Daily ownership and upkeep

Owners favor the pressure, battery life and value, with the main complaint being spray mess while learning the technique; controls can also be pressed accidentally. The manual says the unit cannot run while charging and warns against iodine, salt water, concentrated essential oils and undiluted mouthwash. An incompletely seated nozzle can leak, per COSLUS’s own troubleshooting. Clean the tank and the silicone tube filter, and replace the four tips every 6 months.

Repairs, warranty and value

The battery is not user-replaceable, so the realistic lifespan is the pack’s, and there is no official replacement battery, pump, tank or seal kit. Tips cost $15.99, which is close to the sale price of the whole unit. The warranty is 2 years with a 30-day money-back window. COSLUS direct listed the black C30 at $24.99, a Walmart listing showed $15.95 in early September, and the tip set is $15.99. At the low end of that range this is a strong feature-per-dollar buy; near $30 or above, better-documented alternatives and newer COSLUS models weaken the case. Check the store panel above for current prices.

Which model this is

This page covers the COSLUS C30 Custom-Mode Cordless Water Flosser, manufacturer model FC5360. Don’t merge it with the C30 toothbrush or the WFP15 and CX30 models. The US listing is ASIN B0CHFT6T5P.

Sources

Manufacturer:

Independent reviews:

Owner reports:

Manual mirrors:

Buying guides for this category

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