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Gravity Water Filter/Purifier Performance Comparison Chart

Company

Berkey Europe

AquaCera

AquaCrock

Pro Pur

Doulton

Aqua Rain

Katadyn

Model

Big Berkey

Ceragrav-LP5

AquaCrock 

Pro Big

GSS-2

Model 400

Gravidyn

Virus Removal (A)

Yes

No

No

No

No

No

No

Element Rating

Purifier(A)

Filter

Filter

Filter

Filter

Filter

Filter

Max. Daily Output (ltr./day)

318

38

68

34

53

45

91

Max. Daily Output -Max.# Elements

636

95

68

70

76

91

91

Approx. People Served (B)

42

6

5

4

5

6

6

Maximum liters/element

11,350

2025(C)

2025(C,D)

5678(E)

2025(C)

4145(F)

2763(G)

Replacement Time Limitation

No Time Limit

6 Months(C)

2 Years(C,D)

12 Months(E)

6 Months(C)

1 Year(F)

Up to 6 Months

Maximum Element Capacity

4

5

3

4

4

4

3

Food Color Test (I)

Pass

Fail

Fail

Pass

Fail

Fail

Fail

Turbidity Flow Rate Test (J)

Pass

Pass

Pass

Pass

Pass

Fail

Pass

Test Results Available

Yes

Yes

Yes

No

Yes

Yes

Yes

Tested to NSF Standards

Yes

Yes

Yes

Yes

Yes

Yes

Yes

NSF Certified Claimed

No

No

No

Yes(K)

No

No

No

Guarantee

6 Mos.(filter 2 yr.)

None Published

1 year Ltd.

2 year

None Published

None Published

None Published

System Material

AISI 304 Stainless

HDPE

Ceramic

Stainless

AISI 304 Stainless

Stainless

Silicone

System Production

Plasma Welded

Molded

Kiln

Deep Drawn

Plasma Weld

Deep Drawn

Molded

 Other Information

Element Composition

Proprietary

Ceramic/Carbon

Ceramic/Carbon

Ceramic/Carbon

Ceramic/Carbon

Ceramic/Carbon

Ceramic/Carbon

Number of Elements

2

2

3

2

2

2

3

Element Height

22.8 cm.

17.8 cm.

12.7 cm.

22.8 cm.

17.8 cm.

22.8 cm.

26.4 cm.

Elements Cleanable

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Storage Tank Capacity (liters)

8.5

13.25

Not Stated

10.4

8.5

11.3

9.8

Electricity Required

No

No

Yes

No

No

No

No

Plumbing Required

No 

No

No

No

No

No

No

Post Filters

Yes

Yes

Yes

Yes

Yes

No

No

Height

48.9 cm.

72.4 cm.

44.4 cm.

54.6 cm.

48.9 cm.

52 cm.

45.7 cm. 

Diameter

21.6 cm.

28.6 cm.

27.9 cm.

23.5 cm.

21.6 cm.

27.9 cm.

27.9 cm.

Dry Weight (Approx.)

2.7 kg.

2.27 kg.

11.8 kg.

2.26 kg.

2.5 kg.

3.18 kg.

2.95 kg.

 (A) = Purification Standards: Element must remove/inactivate all types of pathogenic organisms.  Specifically, element must remove two species of virus to 4 Log10 (=> 99.99%) and remove pathogenic bacteria to 6 Log10 (=> 99.9999%) and remove cysts to 3 Log10 (=> 99.9%). This makes Berkey systems the only true gravity fed purification systems.
Purification Challenge: The Standard has selected 3 types of challenge organisms: Bacteria (Klebsiella terrigena), Viruses (Polio and Rota) and Protozoan Cysts (Giardia or Cryptosporidium).
VIROLOGY -  Demonstration of a 4 Log10 (99.99%) reduction is required on the combined polio/rota virus challenge matrix.
BACTERIOLOGY - Demonstration of a 6 Log10 (99.9999%) reduction is required for the Klebsiella terrigena bacterial challenge.
CYST REMOVAL - Demonstration of a 3 Log10 (99.9%) reduction is required for the cysts using Cryptosporidium or Giardia.

(B) = Number based on 7.6 liters per day per person, system used 12 hours per day.

(C) = Aqua Crock, Doulton GSS-2, Ceragrav LP-5 all use Doulton Filter Elements - life expectancy is 1987 liters or 6 months, whichever occurs first.

(D) = Claim made is 2 years or 11,350 liters; while the manufacturer of their Doulton filter elements states the life expectancy is 1987 liters or 6 months whichever occurs first.

(E) = While the company claims their elements will last for 11,350 liters on their comparison chart, we used the claims of the manufacturer, which state that the life of the elements is only 5,678 liters or 12 months whichever occurs first.

(F) = Calculation based on each element producing 11.3 liters when used for 12 hours per day during 365 day maximum recommended time limitation.

(G) = Calculation based on each element producing 45 liters if used for 12 hours per day during 182 day maximum recommended time limitation.

(H) = Cost per liter presumes maximum liter claims reached prior to "replacement time limitation" above and calculated based on "max daily output" above, whichever is less or occurs first.

(I) = Successfully demonstrates removal of microscopic red food coloring particulate from source water at 1 tablespoon of red food coloring per 4 liters.

(J) = Test is designed to determine if high turbidity (larger particulate) source water will clog up elements which may render them ineffective during actual emergency conditions. 1 tbsp carbon dust per 4 liters. Flow rate reduction of <25%=Pass, >25%=Fail.

(K) = NSF Claims: No listing on NSF website as of publication date. NSF has confirmed that ProPure has not been certified by their organization

Where information was available and published, this information was used. Where information was not available, information was calculated, such as in F and L above, using the available published information. Where published information on systems was in conflict with the published information by the manufacturer, such as in C, D, and E above, items are highlighted in orange.

Data based on manufacturer's life expectancy claims rather than the claims of the manufacturer's customer. Information collected from websites, corporate literature, internal testing and outside independent sources is believed to be accurate at time of publication. Neither this chart nor it's producer assume any liability,
implied, expressed or assumed.

There are other gravity fed filter systems that claim they are not to be used with microbiologically unsafe or questionable water. We chose not to include those systems in this comparison chart.

 

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