From: –The Berkey Guy
Recently, a product was introduced into the marketplace that directed its marketing toward users of the Berkey® Water Purification Systems, particularly the Big Berkey® model. It has promoted itself as an alternative choice and the manufacturer of the Berkey® systems has tested its performance in two ways:
- Flow Rate
The following comses directly from the manufacturers of the Berkey® Water Purification Systems in their testing of this alleged alternative choice against the Black Berkey® Purification Elements:
…we thought we would put this “new” system to the test.
A fully configured four element Big Berkey® system can produce up to 7 gallons per hour of purified water.(1) By comparison this fully configured alternate system only holds two filter elements (the large diameter of the elements precludes the system from accommodating more than two elements).(2,3) The alternative system when full only produces a mere 80 ounces per hour. However, the flow rate rapidly decreases as the water level declines. For example, when 70% full, the flow rate declines to approximately 62 ounces per hour. At 50% full the flow rate declines to about 44 ounces per hour and at 1/3 full the flow rate drops to a mere trickle of about 26 ounces per hour (approximately 5 (five) hours to produce a gallon of water). Averaging out the above rates, one would expect a typical run cycle to produce an average of 53 ounces per hour. This is an average of one gallon of water produced every 2 1/2 hours.
So let’s do an economic comparison: Assuming the alternative system is topped off continually, it can produce about 15 gallons per day whereas a fully configured Big Berkey® system can produce about 168 gallons per day. Therefore it takes over eleven of the alternative systems to produce as much water at one Big Berkey® 4X4 system.
So here are the numbers:
This test is designed to “overwhelm” the elements with a chemical contaminate in order to determine at what point a chemical breakthrough occurs. We added chlorine (Clorox®) to the water but found that we could not complete the test because after approximately 1-1/4 cups of Clorox had been filtered through the alternative filters, they began to break down. After 1-1/4 cups of Clorox® had been purified through the Black Berkey® elements, they continued to maintain their effectiveness. In the alternate, we decided to compare their respective performance. To do this we inserted both of the test elements, side by side, into a Berkey Light™ housing and added an additional cup of Clorox® to the pre-filtered source water. We also quarantined the water from the alternate filter element from that of the Black Berkey® purification element by inserting a canning jar under the effluent stem of the alternate filter.
Below is what we found:
1 Fully configured Big Berkey® water purification system contains 4 Black Berkey® purification elements.
2 Fully configured alternate system contains alternate filtration elements.
3 Literature and website claim expansion to 3 elements. System obtained for test purposes did not
physically allow this expansion; the elements were too wide at the base to allow claimed full
4 Based on assembly instructions which stated: “…fill the upper container fully with cold or room
temperature water. Allow all water to flow into the lower container. Open the spigot and discard the
water in the lower container. Let your system stand unused overnight. Refill upper chamber and
repeat…” In other words, “alternate” system would not be available in an emergency situation until 48
hours after set-up.
5 No flow rate is established on “alternate” website or literature.
6 Claims NSF 42 certification – no such listing appears on NSF website using any combination of the
alternate name or parent corporation.