AI Visibility Audit — interactive dashboard
Cascade Outdoor Co.
Gravity-fed water filters (off-grid / emergency preparedness) · 2026-06-10 · 61 scored runs · ChatGPT (gpt-5.5-2026-04-23) · Perplexity (sonar)
The verdict
Across 61 scored runs of 10 real buying-intent questions, Cascade Outdoor Co. was named zero times. Berkey leads with 31.9% share of voice. The shortlist is forming inside the answers — without you on it. The tabs above hold the evidence; the roadmap holds the fix.
Who owns the category answers?
ChatGPT
Perplexity
Prompt-by-prompt results
Best gravity-fed water filter for an off-grid cabin? expand_more
What water filter should I buy for emergency preparedness at home? expand_more
Berkey vs ProOne — which gravity water filter is better? expand_more
Is the Berkey water filter worth the money? expand_more
What are the best alternatives to Berkey water filters? expand_more
Which gravity water filter removes the most contaminants? expand_more
Best budget gravity water filter under $100? expand_more
What is the longest-lasting gravity water filter? expand_more
Do gravity water filters remove viruses and bacteria? expand_more
Which water filter brands do preppers actually recommend? expand_more
Flagged claims
“- It’s a more conservative choice than Berkey because Berkey has strong marketing and long filter-life claims, but many buyers are concerned about the distinction between “tested to NSF standards” and **formally NSF-certified** systems.”
Prompt: Best gravity-fed water filter for an off-grid cabin?
“Multiple current guides and user discussions flag that Berkey’s claims are not the same thing as straightforward NSF certification.”
Prompt: Best gravity-fed water filter for an off-grid cabin?
“Consider **ProOne Big+** or a similar stainless gravity system using certified replacement elements.”
Prompt: Best gravity-fed water filter for an off-grid cabin?
“Recent reviews describe ProOne’s Big+ as using NSF/ANSI 42 and 53 certified filters and position it as a common Berkey alternative.”
Prompt: Best gravity-fed water filter for an off-grid cabin?
“Berkey-style stainless tanks are convenient, but Berkey has had regulatory and certification controversy, and many current off-grid/prepper discussions focus on the lack of clear NSF certification for some popular Berkey elements.”
Prompt: Best gravity-fed water filter for an off-grid cabin?
“Berkey has been the classic off-grid cabin choice for years, and many owners like the taste and long filter life.”
Prompt: Best gravity-fed water filter for an off-grid cabin?
“I’ll look for ProOne certificates and see if any relevant information is available from the NSF or other official sources.”
Prompt: Best gravity-fed water filter for an off-grid cabin?
“- Current buyer guides consistently point to **ProOne Big+** as the strongest certified gravity option, with certifications cited for NSF/ANSI standards such as 42, 53, 401, and/or 372 depending on model/filter listing.”
Prompt: Best gravity-fed water filter for an off-grid cabin?
“- It avoids the biggest Berkey downside: **Berkey’s lack of full NSF certification and regulatory uncertainty** around Black Berkey elements.”
Prompt: Best gravity-fed water filter for an off-grid cabin?
“- **Sawyer bucket/gravity-style system** — strong value, good for bacteria/protozoa, high capacity.”
Prompt: What water filter should I buy for emergency preparedness at home?
“- **ProOne / ProPur-style gravity systems** — ceramic/carbon elements; some models claim NSF P231-style microbiological purification.”
Prompt: What water filter should I buy for emergency preparedness at home?
“- **Backpacking filters like Sawyer Squeeze or Katadyn BeFree as your only plan** — they’re great for bacteria/protozoa, but most do **not** remove viruses.”
Prompt: What water filter should I buy for emergency preparedness at home?
“| **Certification transparency** | Historically weak; Berkey has long relied on its own/third-party testing rather than full NSF certification | Better: ProOne publishes lab reports and states NSF/ANSI 42 component certification / IAPMO certification for G3.”
Prompt: Berkey vs ProOne — which gravity water filter is better?
“Some newer Berkey/Phoenix replacement elements now appear to claim certification to **NSF/ANSI 42** and **NSF/ANSI/CAN 372**, according to Berkey’s support page.”
Prompt: Berkey vs ProOne — which gravity water filter is better?
“| **Verified certifications** | **ProOne** | ProOne lists IAPMO certifications for NSF/ANSI 42, 53, 401, and NSF/ANSI/CAN 372 on the Big+ product page, including links to certification files.”
Prompt: Berkey vs ProOne — which gravity water filter is better?
“ProOne’s current Big+ page states certification by IAPMO R&T for **NSF/ANSI 42**, **NSF/ANSI 53**, **NSF/ANSI 401**, and **NSF/ANSI/CAN 372**, including claims for chlorine/chloramine, particulates, lead, total PFAS, and microplastics.”
Prompt: Berkey vs ProOne — which gravity water filter is better?
“- **Price/value:** ProOne is generally cheaper upfront; one review says Berkey’s per-gallon cost can be lower over time because of longer filter life, but that advantage narrows if you add Berkey’s fluoride filters.”
Prompt: Berkey vs ProOne — which gravity water filter is better?
“**Berkey is usually the better pick for maximum *overall* filtration and filter lifespan, while ProOne is often the better pick for *value*, built-in fluoride reduction, and faster flow.”
Prompt: Berkey vs ProOne — which gravity water filter is better?
“- **Lifespan:** Berkey filters are commonly cited as lasting longer, which can lower cost per gallon over time; ProOne filters are usually rated for a shorter life.”
Prompt: Berkey vs ProOne — which gravity water filter is better?
“- **Filter lifespan:** Berkey filters are commonly cited as lasting longer per filter, while ProOne filters are often rated for shorter replacement intervals.”
Prompt: Berkey vs ProOne — which gravity water filter is better?
“- Choose **Berkey** if you want the safer default for long-term ownership, longer lifespan, and broader third-party confidence in the brand’s gravity systems.”
Prompt: Berkey vs ProOne — which gravity water filter is better?
“Berkey has long relied on independent lab tests rather than full NSF/ANSI certification for many of its major claims.”
Prompt: Is the Berkey water filter worth the money?
“Some Berkey-related pages and dealers describe lab testing, but that is not the same thing as being certified to specific NSF/ANSI standards.”
Prompt: Is the Berkey water filter worth the money?
“- Are comfortable with Berkey’s lab-test-based evidence rather than full NSF/ANSI certification.”
Prompt: Is the Berkey water filter worth the money?
“Berkey has long relied on its own/commissioned lab testing rather than broad NSF/ANSI certification for its classic Black Berkey elements.”
Prompt: Is the Berkey water filter worth the money?
“nsf/Filings/CF9D8104501D2D5C8525896A0079AABD/%24File/Berkey%20FIFRA%20SFIFRA-08-2023-0015%20SURO%20Fritz%20Wellness%202023.”
Prompt: Is the Berkey water filter worth the money?
“Berkey Canada's statement says NSF's updates may be dubious.”
Prompt: Is the Berkey water filter worth the money?
“The classic **Black Berkey** elements have long been controversial because they rely heavily on company-published and third-party test reports rather than full NSF/ANSI certification for the specific contaminant claims.”
Prompt: Is the Berkey water filter worth the money?
“Several recent reviews still flag lack of NSF certification for Black Berkey elements as a major drawback.”
Prompt: Is the Berkey water filter worth the money?
“- **Why people think it is worth it:** Berkey systems are praised for low cost per gallon over time, long filter life, no electricity requirement, and countertop convenience.”
Prompt: Is the Berkey water filter worth the money?
Sample edition shows claims as flagged. Client editions verify each against ground truth: accurate / outdated / hallucinated.
Where engines look
Third-party domains cited across all runs. Presence on these is how new brands enter the answers.
Can AI crawlers see the category?
| Domain | robots.txt | GPTBot | ClaudeBot | PerplexityBot |
|---|---|---|---|---|
| berkeyfilters.com | error:TypeError | unreachable | unreachable | unreachable |
| sawyer.com | 200 | allowed | allowed | allowed |
| alexapure.com | 200 | allowed | allowed | allowed |
| prooneusa.com | 200 | allowed | allowed | allowed |
| platy.com | 200 | allowed | allowed | allowed |
| www.berkeyfilters.com | error:TypeError | unreachable | unreachable | unreachable |
Live fetches, 2026-06-10. “unreachable” = the site refuses automated requests — including the crawlers that feed answers.
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