HydroCap UV-C
Self Cleaning Water Bottle Cap

HydroCap from WAATR is a UV-C Self Cleaning Water Bottle Cap for wide mouth bottles like Hydro Flask, Iron Flask, etc. Engineered to purify water and self-clean bottle with spatially placed dual 20 mW UV-C LEDs, HydroCap can eliminate up to 99.99999% of bacteria and viruses, keeping your water always clean.


Water Bottle Replacement Cap with spatially placed dual 20nw UV-C LEDs, to eliminate waterborne bio-contaminants, including E.Coli, up to 99.99999%.  It comes with two purification modes, Normal and Pro mode, and also automatically self cleaning every hour to keep your bottle clean from germs and unpleasant smell.

Special Price: $248

Original Price: $680

Friendly Use

HydroCap powerful UV-C rays automatically blast inside your bottle every hour for 20 seconds to keep your bottle stink-free.  It is IPX 7 waterproof, with port less magnetic charging design, allowing you to complete wash your bottle at every angle while protecting from water damages.  

HydroCap comes with UV-C safety sensor and patented shield to prevent accidental eye exposure of UV lights.  It also has Smart Hydration Reminders to notify you to stay hydrated every 30 minutes throughout the day.

Fits Hydro Flask and Various Brands

HydroCap is the perfect self cleaning water bottle cap for your wide mouth Hydro Flask, Iron Flask, Simple Modern, Takeya, MIRA, Klean Kanteen, FIFTY/FIFTY, Hydro Cell, Thermoflask, Gold Armour, and many others.


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Special Price: $248

Frequently Asked Questions

HydroCap UV light rays are on the same wavelength (in the range of 278nm) as the UV used to sanitize hospital operating rooms, water treatment plants, and other industrial applications. The deep UV-C LED destroys the nucleic acid within the DNA of microorganisms.  

HydroCap can eliminate waterborne bio-contaminants, viruses, and bacteria, including E.Coli, up to 99.99999%.

HydroCap is designed to fit most Wide-Mouth Bottles, including Hydro Flask, Iron Flask, Simple Modern – Summit, MIRA, Takeya, Klean-Kanteen, FIFTY/FIFTY, Hydro-Cell, ThermoFlask, Gold Armour, etc.

For sizes 12, 16, 18, 32, 40, 64, 128 oz (bottle mouth size 2.28” diameter).

Normal Mode is activated by tapping the touch sensor on the cap twice (UV is activated for 60 seconds). 

Pro Mode is activated by tapping the touch sensor on the cap 3 times (UV is activated for 3 minutes). 

Charging your HydroCap is very easy. A port-less magnetic charging cable is included with your HydroCap. Simply place the charger on top of the cap, and it will fully charge in 4 hours or less.

Tap the touch sensor once. The light ring will illuminate 1 of 3 colors:

Green light indicates >50% battery life

Orange light indicates 25%-49% battery life

Red light indicates <25% battery life

HydroCap is expected to last 7 days on a full charge.

The HydroCap is completely waterproof, so you can either wash the cap with mild soap and water, or clean it with alcohol wipes.

Modus Hong Kong Limited provide 1 year warranty for the HydroCap.


WAATR brand is from Florida, USA.  Since the launch in 2019, WAATR has become an integral part of thousands of homes and communities, providing safe, refreshing hydration, no matter where our customers’ adventures take them. 

Their products, HydroCap, CrazyCap, and LYT, uses UV-C to sterilize germs, bacteria, and viruses, up to 99.99999%.  CrazyCap was voted by Time Magazine as “One of the Best Invention of the Year”, and have been recognised by CNet and Women’s Health Fit Tech awards as the Best Self-Cleaning Water Bottle.

Modus is the exclusive distributor of WAATR brand and its products in Hong Kong.

© 2024 All rights reserved​

Modus Hong Kong Limited

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