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Which Berkey for Me?

Berkey Selection Guide

No. of Sets (2) of Filters

Holding Capacity (Gallons) (Liters)

Flow Rate (GPH) (LPH)

Cycle Time * (Hours)

Gallons / Day Filtered ** (Min to Max) (Liters)

People Supported per Day ***

Maximum Gallons / Day Filtered **** (Liters)

Travel Berkey

1

1.5

(5.7)

2.75

(10.4)

0.55

18

(68.4)

2 to 10

66

(250)

Berkey Light

1

2.75

(10.4)

3.75

(14.2)

0.73

33

(124.8)

4 to 30

90

(341)

2

7.5

(28.4)

0.37

66

(249.6)

180

(682)

Big Berkey

1

2.25

(8.5)

3.5

(13.2)

0.64

27

(102)

4 to 25

84

(317)

2

7

(26.5)

0.32

54

(204)

168

(636)

Royal Berkey

1

3.25

(12.3)

4

(15.1)

0.81

39

(147.6)

6 to 35

96

(362)

2

8

(30.3)

0.41

78

(295.2)

192

(727)

Imperial Berkey

1

4.5

(17)

5.5

(20.8)

0.82

54

(204)

25 to 80

132

(499)

2

11

(41.6)

0.41

108

(408)

264

(998)

3

16.5

(62.5)

0.27

162

(612)

396

(1500)

Crown Berkey

1

6

(22.7)

6.5

(24.6)

0.92

72

(272.4)

35 to 150

156

(590)

2

13

(49.2)

0.46

144

(544.8)

312

(1181)

3

19.5

(73.8)

0.31

216

(817.2)

468

(1771)

4

26

(98.4)

0.23

288

(1089.6)

624

(2362)

* Cycle Time is the amount of time it takes to fill the filter to Holding Capacity
** Gallons (L) / Day Filtered is based on making the Holding Capacity of the filter continuously for up to 12 hr
*** People Supported per Day based on Gallons (L) per Day Filtered / 2 gallons per day per person (7.6 liters)
**** Maximum Gallons (L) / Day Filtered based on filtering at maximum Flow Rate for 24 hours
Note: Flow rate decreases as water level declines
Flow rates calculated with upper chamber full to top and stated in Gallons (Liters) per Hour (GPH)
All Flow Rates and Capacities are in gallon (liters) unless otherwise specified

 

Factors to Consider

 

 Daily Water Requirements

Whereas a quart of water or other fluid daily will sustain life, it is recommended that we drink one-half to one gallon of water per day.  If preparing for emergency, one additional gallon provides added comfort and accommodates increased fluid needs at higher altitudes, for warm climates or special need individuals. An additional one-half to 1 gallon per day is recommended for bathing and hygiene, and to wash dishes.  Please make a determination as to the number of people within the group and whether or not the system will be used for every day use or emergency use.  For our calculations,  we used the highest recommended amount of two gallons required per day.  After determining how much per day per person and how many people in your group refer to the chart above to select the correct size Berkey filter for your needs.

If your water requirements are more than two gallons per person per day or if you plan on using the water filter for anything other than drinking, cooking and hygiene, we recommend that you purchase the next larger size system indicated on the chart above.

 Peak Water Demand

You need to factor in your peak water demand as well.  For instance, you are cooking a meal using your filtered water for coffee, tea, spaghetti etc and then your family arrives using water for drinking.  You do not want your peak water demand to exceed the Holding Capacity of your selected unit.  So you want to make sure the Holding Capacity of the filter system you select is large enough to cover your peak water consumption needs.

System Capacity and Flow Rate

When determining the best size for your situation, consider that the larger the system’s capacity, the less frequently it will need to be refilled.  All filters are configured with two Black Berkey® Purification elements however; the Berkey Light and the four larger stainless steel systems are expandable as to the number of elements installed which means as you add more sets of elements, the higher the Flow Rate and the shorter the Cycle Time is to re-fill the system.

By selecting the largest capacity required for your future needs, you will insure expandability later on.  If you determine that you have increased water needs, an investment in another filter will not be necessary; you can simply order additional sets of filter elements to expand your current system.

Selecting for a Larger Group

There are two Berkey® systems that will accommodate large groups, they are:

The Imperial Berkey® system, when configured with the maximum number of six Black Berkey® purification elements, can purify ~ 400 gallons per day (16.5 gallons per hour). This is enough to provide for up to 200 people on a sustained basis at 2 gallons per day and up to 800 people for short-term emergency needs at 1/2 gallon per day.

The Crown Berkey® system, when configured with the maximum number of eight Black Berkey® purification elements, can purify ~ 625 gallons per day (26 gallons per hour). This is enough to provide for up to 312 people on a sustained basis at 2 gallons per day and up to 1,250 people for short-term emergency needs at 1/2 gallon per day.

If you are selecting a Berkey for a larger group, we advise you to consider purchasing several Sport Berkey® purification bottles as well.  These compact individual purification systems were developed for use in third world countries and are handy when situations requires you be away from the location of your larger purification system.