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)
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Executive overview
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. Every evidence section and the complete fix roadmap follow below.
02 · SHARE OF VOICE
Who owns the category answers?
The category leader, the challengers and the invisible client—measured from the same prompt set.
ChatGPT
Perplexity
03 · PROMPT EVIDENCE
Every buyer question, engine by engine
All 10 audited prompts are visible below. Open any row to inspect which brands each engine recommended or merely mentioned.
Best gravity-fed water filter for an off-grid cabin?
What water filter should I buy for emergency preparedness at home?
Berkey vs ProOne — which gravity water filter is better?
Is the Berkey water filter worth the money?
What are the best alternatives to Berkey water filters?
Which gravity water filter removes the most contaminants?
Best budget gravity water filter under $100?
What is the longest-lasting gravity water filter?
Do gravity water filters remove viruses and bacteria?
Which water filter brands do preppers actually recommend?
04 · CLAIM FINDINGS
What the engines are telling buyers
“- 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.
05 · CITATION SOURCES
Where engines look
Third-party domains cited across all runs. Presence on these is how new brands enter the answers.
06 · TECHNICAL ACCESS
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.
07 · PRIORITISED ACTION
Fix roadmap — 60–90 days
The report ends with an owner, timing and expected impact for every action—not an undifferentiated list of recommendations.
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Answers come only from this report's data, with section references. No model call and no outside speculation.
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