One tablet makes 20 liters of questionable water safe to drink
Is this the right fit?
- Best for
- emergency and hurricane kits, base camp, international travel, and as a backup when a filter clogs or freezes
- Skip if
- Chlorine treatment does not remove sediment, chemicals, or heavy metals and it is not reliable against cryptosporidium, so silty water should be pre-filtered and known-contaminated sources need a different approach
- Check before ordering
- Confirm the dimensions, exact model, included parts and return terms on the Amazon listing before ordering.
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Aquatabs are effervescent water purification tablets using NaDCC, which releases free chlorine to kill bacteria and viruses in untreated water. This is the 397mg strength in a 100-tablet pack, where each tablet treats roughly 20 liters, so the pack covers about 2,000 liters total. That dosing is the key distinction from the small 49mg tablets, which treat a single liter each and suit day hikes; the 397mg size is built for filling a large container, a camp jug, or a bathtub during an outage. Tablets store for years dry and weigh essentially nothing, which is why they belong in a kit even when a filter is the primary method. Best fit: emergency and hurricane kits, base camp, international travel, and as a backup when a filter clogs or freezes.
Pros
- Each 397mg tablet treats roughly 20 liters, so a 100-pack covers about 2,000 liters
- Sized for a camp jug or a filled bathtub rather than a single water bottle
- Tablets store for years dry and weigh almost nothing, so they cost nothing to keep on hand
- Chlorine-based treatment inactivates viruses, which most pump and squeeze filters do not
Cons
- Chlorine treatment does not remove sediment, chemicals, or heavy metals and it is not reliable against cryptosporidium, so silty water should be pre-filtered and known-contaminated sources need a different approach
Frequently asked questions
How much water does one tablet treat?
The 397mg tablets treat roughly 20 liters each, which is why this size is meant for large containers. The smaller 49mg tablets treat about one liter and are the ones to buy for a single water bottle.
Does it kill everything in the water?
Chlorine-based treatment handles bacteria and viruses well. It is not reliable against cryptosporidium, which is chlorine-resistant, and it does nothing for chemicals, heavy metals, or sediment. Pair it with a filter when the source is questionable in those ways.
How long do I wait before drinking?
Follow the package instructions, which typically call for around 30 minutes of contact time. Cold or cloudy water needs longer, so do not shorten the wait to save time.
How long do the tablets last in storage?
Unopened tablets keep for years, which is what makes them a staple in emergency kits. Once a blister is opened the tablet degrades quickly on exposure to air and humidity, so open only what you are about to use.
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