Water · Water Treatment
Extends stored tap water to a 5-year shelf life with a single dose. One small bottle treats up to 55 gallons. The only product of its kind registered and licensed by the U.S. EPA for long-term water storage.
The basics
Water Preserver Concentrate is a liquid additive you add to stored tap water to extend its safe shelf life to five years. It is a stabilized, pH-balanced form of sodium hypochlorite that kills bacteria, viruses, mold, and fungus in the stored water and prevents their re-growth for the full storage period.
The important distinction: this is a preservative, not a purifier. You add it to water that is already safe — clean tap water from a municipal supply or other potable source. It does not make questionable or contaminated water safe to drink. If you are drawing water from an unknown source, use purification tablets or boiling first, then consider storage.
Without a preservative, stored tap water needs to be rotated every three to six months to stay safe. Water Preserver eliminates that rotation cycle, reducing long-term maintenance for households building a serious water supply. One 0.73 oz bottle treats up to 55 gallons. For most households storing water in 7-gallon containers, a single bottle handles the entire supply at roughly 8 drops per gallon.
It is registered and licensed by the U.S. EPA (EPA No. 61428-1) and state EPAs for 5-year water storage, and was laboratory tested for over a decade to verify that potency. There is essentially one product in this category — Water Preserver Concentrate — sold under a few brand names. All are the same proprietary formula.
Preservative, not purifier. Water Preserver Concentrate only works with potable tap water. Do not use it to treat water from a well, stream, rainwater catchment, or any source you would not drink untreated. For those sources, purify first with purification tablets or boiling.
Quantity
One bottle of Water Preserver treats up to 55 gallons. For most households the math is simple: count your storage containers, multiply by their capacity in gallons, and divide by 55 to know how many bottles you need.
| Storage setup | Total gallons | Bottles needed |
|---|---|---|
| 4 × 7-gallon Aqua-Tainers | 28 gallons | 1 bottle |
| 8 × 7-gallon Aqua-Tainers | 56 gallons | 2 bottles |
| 1 × 55-gallon drum | 55 gallons | 1 bottle |
| 2 × 55-gallon drums | 110 gallons | 2 bottles |
Stock one extra bottle. Keep a spare on the shelf alongside your storage supply. The concentrate itself has a shelf life of 6 to 9 months — check the use-by date printed on the bottom of each bottle. A spare means you will always have fresh concentrate ready when you need to treat new containers or replace water at the 5-year mark.
Storage
There are two different shelf lives with this product, and confusing them is the most common mistake. The treated water lasts five years. The concentrate itself does not.
Concentrate (unopened bottle)
6 – 9 months
Check the use-by date on the bottom of every bottle before purchasing and before use. An expired bottle of concentrate may not preserve your water for the full five years.
Treated water (in sealed containers)
5 years
The five-year storage cycle begins when you add the concentrate to water. Mark the treatment date on each container. Replace at the five-year mark.
Store the concentrate bottles in a cool, dark location in their original packaging. Do not expose to direct sunlight or extreme heat, which accelerates degradation. Do not open a bottle until you are ready to treat a container — once opened, use it immediately.
The five-year storage guarantee applies to new or thoroughly cleaned, sealed, food-grade containers made of rigid polyethylene (HDPE plastic). The manufacturer specifies blow-molded containers made of virgin polyethylene resin. Standard water storage containers like 55-gallon barrels and 7-gallon Aqua-Tainers meet this requirement. Repurposed containers, glass, metal, or flexible bags are not recommended for the full 5-year cycle. The container must be airtight — seal any container tightly after treatment and store away from light and heat.
Context
All three products use chlorine chemistry, but they serve completely different roles in a water preparedness system. Using the wrong one for the wrong job leaves your water either unprotected or unsafe.
Water Preserver Concentrate
Stabilized, long-residual formula designed to maintain potency in sealed storage for five years. Use it once at the time of storage. Does not work on unsafe water.
This product — storage preservative
Household Bleach (unscented, 6 – 8.25%)
Fast-acting disinfection for treating questionable water during an emergency. Short shelf life (6 to 12 months), lower residual action. Better for treating water on demand than preserving a long-term supply.
Emergency disinfection
Chlorine Dioxide Tablets
Widest-spectrum treatment option, including Cryptosporidium coverage. Best for treating water from unknown sources in the field. Not designed for long-term bulk storage preservation.
Field purification
Dosing
Follow the label exactly. The instructions below reflect the manufacturer's directions. Check the use-by date on the bottle before use — do not apply concentrate past its expiration date.
Only use with clean tap water. Water Preserver Concentrate is registered by the EPA as a storage preservative for potable water. Applying it to water from an untreated source will not make that water safe to drink. Per manufacturer instructions, verified against EPA registration No. 61428-1. Last verified June 2026.
Where to buy
Water Preserver Concentrate is sold under several brand names on Amazon (ER Emergency Ready, Mayday Industries, and others) but the formula is the same proprietary blend. Look for any listing that confirms EPA registration. Check the seller's stock date or the listed use-by date before ordering — concentrate has a 6 to 9 month shelf life, and slow-moving inventory may arrive close to expiration.
Affiliate disclosure: New World Survival earns a small commission on qualifying Amazon purchases at no cost to you. This helps us cover operating costs and keep building new content. This helps us cover operating costs and keep building new content.
Related
How to build a complete water supply, from containers to rotation to treatment.
Emergency disinfection for water you need to treat on demand, not preserve in storage.
The 7-gallon container this product is most commonly used with.