The Filter Question — What Actually Works
Week 2 compared every serious water filter in the 2026 market — portable, gravity, and reverse osmosis — and explained the Berkey situation clearly. Seven field notes, seven conversations the preparedness community is actively having.
What we covered this week
Rainwater Collection Is Legal in All 50 States
The myth settled. Colorado: 110-gal cap. Utah: 2,500-gal with free registration. All others: unrestricted.
LifeStraw vs Sawyer Squeeze: The Only Comparison That Matters
100,000 gallons vs 500 gallons. The capacity gap settles it for household preparedness.
Waterdrop vs ProOne: The Two Leading Berkey Replacements
Waterdrop: NSF 42/372, lowest ongoing cost. ProOne: NSF 42/53/401/372, best PFAS coverage.
Gravity Filter vs Reverse Osmosis: Which Belongs in Your Kitchen?
Gravity wins on portability and outages. RO wins on certified chemical removal. Many households benefit from both.
WaterBrick vs Aqua-Tainer: Stackable vs Budget
Aqua-Tainer wins on value at $20/7 gal. WaterBrick wins on space efficiency at 6 inches tall.
Culligan MaxClear: The New Gravity Filter Nobody Expected
Built on ProOne platform, IAPMO certified. Filter replacement life is shorter — verify specs before buying.
The 2026 Gravity Filter Roundup: Every Serious Option Ranked
All six systems compared — certifications, filter life, cost per gallon, and best-fit situation for each.
The week's insight
Certification specificity is the signal of a trustworthy filter.
Filters that claim to remove everything broadly are less trustworthy than filters that claim to remove specific contaminants with independent certification. NSF 53 with PFOA/PFOS in the contaminant list is meaningful. "Removes 99% of contaminants" without a certified source is not. The Berkey situation illustrates this exactly — the EPA dispute was specifically about unsubstantiated antimicrobial claims.
This week's action
Run a gallon of tap water through your filter. Time how long it takes.
If you have a portable filter, fill a container, attach it, and time the flow. Practice backflushing once. If you have a gravity filter, top off the upper chamber and note when it empties — that is your daily flow rate. Knowing how your filter performs before a disruption means you will not be figuring it out during one.
Next week: The News
Week 3 covers water in the headlines — hurricane season prep, boil water advisories, PFAS in 176 million households, the EPA compliance rollback, and what happens to well water when the power goes out. Seven field notes grounded in what is happening right now.
Water Preparedness Hub →