Berkey BioFilm Drops
Keeps stored water fresh in tanks and containers
Copper-silver ion concentrate • 4 drops per gallon • Covers up to 330 gallons
Keep Stored Water Fresh
Berkey BioFilm Drops are a copper-silver ion concentrate made for long-term water storage. Add a few drops when you fill a storage container to help keep the water fresh and the container walls free of biofilm, the slimy film that can build up over time.
The manufacturer rates water stored with the drops for up to 5 years, so you aren't emptying and refilling containers every six months.
Key Benefits
Fresh Stored Water
Helps stored water stay fresh-tasting and odor-free in sealed containers.
Cleaner Container Walls
Helps keep slimy biofilm from forming on the inside walls of tanks and jugs.
Long-Term Storage
Rated by the manufacturer for storage of up to 5 years, with no six month rotation.
Simple Dosing
Four drops per gallon. A measuring vial is included for large drums.
How Much to Add
drops
drops
drops
about 1/3 oz, with the included vial
One bottle covers up to 330 gallons at 4 drops per gallon.
Add, Seal and Store
Use the drops with filtered water going into long-term storage. There's no need to add them to your Berkey for everyday use.
- Fill a clean, food-grade container with filtered water
- Add 4 drops per gallon, or 10 mL for a 55 gallon drum
- Seal the container and store it in a cool, dark place
- Drink straight from the container when you need it
BioFilm Drops Questions
Do I add drops every time I fill my Berkey?
No. The drops are made for water going into long-term storage containers, not for everyday use in your Berkey system.
How many drops do I use?
Four drops per gallon. That's 20 drops for a 5 gallon jug, 120 drops for 30 gallons and 10 mL, about 1/3 oz, for a 55 gallon drum using the included vial.
Do I need to filter the water again after storage?
No. If you stored filtered water with the drops, you can drink it straight from the container.
How long can I store water with the drops?
The manufacturer rates it for up to 5 years in a sealed, food-grade container kept in a cool, dark place.
How many gallons does one bottle cover?
Up to 330 gallons at 4 drops per gallon.
What's in the drops?
A copper-silver ion concentrate. At the recommended dose, copper levels stay below U.S. and World Health Organization drinking water guidelines.
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