55 Gallon Water Preserver Concentrate (5 years) Water Treatment Drops - Water Treatment For Drinking Water - Mayday Emergency Drinking Water - Defiance Fuel Water - Earthquake Water, Emergency Storage

Great to use for a 240 gallon water storage take. After two years, I do not see any algae buildup on tank walls. Too bad the price has gone up from when I first purchased it.

This water preserver concentrate is a must‑have if you’re storing large amounts of water for emergencies. It’s easy to use — one bottle treats a full 55‑gallon drum — and gives real peace of mind knowing the water will stay safe for up to five years. The instructions are clear, and the treatment doesn’t affect the taste. A dependable, no‑nonsense product for anyone building or maintaining an emergency supply. Easy to carry and store, Item was packaged well and did not leak. Good to go.

I have bought these several times. I pour them in my 50 gallons drums when I fill them during hurricane season. They smell like chlorine. Not sure what’s in them but they last a long time. I had them last 6 months.

Works great but a bit pricy!

great additive for storing water

If it does what it says good value and nice sized little bottle for what I needed.

This item is great for storing water for long term.

Came in handy sooner then I thought we had a storm that effected the water and I had already filled up gallons of water definitely have to get another bottle