How Long Can Purified Water Be Stored Safely?
- Sealed: follow the label
- Refills: use within days to 2 weeks
- Cool, closed, out of sun
- Clean bottles are key
On this page
Storage Times at a Glance
| Water | Practical guide |
|---|---|
| Sealed bottled water | Use by the date on the label |
| Opened bottle | A few days |
| Refilled 20 L bottle (kept closed) | Up to about 1–2 weeks |
| Product tank in a refill shop | Recirculate and disinfect daily |
These are practical guidelines; storage conditions matter more than days.
Why Purified Water Can Go Bad
RO and UV remove germs but leave no disinfectant behind. Bacteria from dirty hands, taps or bottles can grow, especially in warm places. That is why refill shops sanitise bottles and disinfect stored water.
How to Store Drinking Water at Home
- Keep containers closed and away from sunlight.
- Use a tap, not a cup dipped into the water.
- Wash and sanitise bottles regularly (how to sanitise 20 L bottles).
- Do not store near chemicals or fuel.
For Refill Businesses
- Sanitise every customer bottle before filling.
- Pass stored water through UV (or ozone) before the filling tap.
- Clean the product tank on a schedule (tank cleaning guide).
Bottle RinserKSh 110,000
H-Tech 1GPM 12W UV SterilizerKSh 6,000
H-Tech 6GPM 25W UV SterilizerKSh 13,000| Product | Price |
|---|---|
| Bottle Rinser | KSh 110,000 |
| H-Tech 1GPM 12W UV Sterilizer | KSh 6,000 |
| H-Tech 6GPM 25W UV Sterilizer | KSh 13,000 |
Current listed prices incl. VAT (updated 7 October 2026).
More: UV vs ozone.
Watch: Starting a water refill business
Frequently asked questions
How long can purified water be stored?
Sealed bottles: as labelled. Refilled 20 L bottles: up to about 1–2 weeks if kept closed, cool and clean.
Does purified water expire?
Water does not spoil by itself, but it can be contaminated by dirty containers or poor storage.
Why does stored water smell?
Usually bacteria or algae from a dirty container or sunlight; clean and sanitise the container.
Should I store water in the sun?
No. Sunlight warms the water and encourages algae.
How do refill shops keep water fresh?
They sanitise bottles, disinfect stored water with UV or ozone, and clean tanks regularly.