Water refill guide
How to Clean a 5-Gallon Water Jug
Short answer: Wash the jug, cap and threads with warm, soapy water and a long-handled bottle brush. Rinse well. When you want to sanitize, the CDC's method is 1 teaspoon of unscented household bleach in 1 quart of water: cap, shake so it touches every inside surface, wait at least 30 seconds, pour it out, and let the jug air-dry. Store it dry, with the cap off, out of the sun.
Step by step: the everyday wash
- Empty it and take off the cap. Pull out any removable cap insert or gasket if your cap has one.
- Wash the inside with warm water and a few drops of dish soap. A long-handled jug brush reaches the bottom and the shoulder, where film builds up. Scrub the threads and the inside of the cap too.
- Rinse well until no soap smell or bubbles are left.
- Let it dry fully, upside down on a clean rack, with the cap off. Don't wipe the inside with a towel.
- Cap it only when you're ready to fill, and store it out of direct sun.
No brush that fits? Many people add a handful of uncooked rice or coarse salt with soapy water, cap it and shake, then rinse well. It's a popular trick, not an official method, so rinse until nothing is left inside.
How to sanitize a jug (when washing isn't enough)
Washing comes first. Sanitizing a dirty jug doesn't work as a shortcut. The CDC's instructions for cleaning and sanitizing water storage containers are:
- Wash with soap and rinse completely.
- Mix 1 teaspoon of unscented liquid household chlorine bleach (5% to 9% sodium hypochlorite) into 1 quart (4 cups) of water.
- Pour it in, cap tightly and shake so the solution touches every inside surface.
- Wait at least 30 seconds, then pour it out.
- Let the empty jug air-dry before you fill it.
The CDC's method gives a ratio, not an amount for a 5-gallon jug. Our inference: one quart of that solution is enough if you shake it well and turn the jug so the solution coats the shoulder and neck. Never mix bleach with ammonia or other cleaners, and use it with some fresh air.
Primo, which runs a 5-gallon exchange program, gives similar advice for its bottles in its Primo Water FAQ: a baking-soda rinse before each use and a bleach sanitize every six months.
What about vinegar? It's all over videos and forums, but the CDC's method uses bleach, so that's what we recommend for sanitizing.
How often should you clean it?
- Every refill trip: a quick look inside and at the threads. Wash it if it's been sitting damp or smells off.
- Regularly: a full soap-and-brush wash. The CDC says storage containers should be cleaned on a regular basis.
- Sanitize when the jug has sat a long time, after anything got into it, or when you can't be sure it's clean. Primo suggests every six months for its bottles.
Green film or algae inside?
Algae needs light. Empty the jug, scrub with soap and the brush, rinse, sanitize as above and dry fully. Then store it out of the sun, and keep filled jugs in a dark, cool spot. If the film won't come off, replace the jug.
When to replace a jug
Replace it if it's cracked, deeply scratched, holds a smell after cleaning, or you can't reach every surface. Never reuse a container that held chemicals like bleach, pesticides or fuel. The CDC warns they can transfer into the water.
At the refill station
A clean jug only stays clean if you fill it carefully:
- Hold it so the opening never touches the nozzle.
- Keep the cap off wet ledges, and hold it by the outside.
- Handle the jug by the body or handle, never the rim.
- Cap it right after filling.
Before you fill, take 30 seconds to check the machine. Bringing your own jug is also how you keep refills cheap: see what a 5-gallon refill costs. Ready to fill? Find a station near you or browse cities. Been to one lately? Leave a review or add a photo on its station page.