3 Filters
3 Filters
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Eligible for free shipping!
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Forsta self-cleaning filters have strong performance advantages over sand filters at a fraction of the cost
Engineers across industrial, municipal and irrigation sectors recommending sand filters for suspended particle removal will improve operations and increase sustainability by switching to self-cleaning screen filters. Water use efficiency, cost effectiveness, space saving, and reliability are some of the profound benefits associated with Forsta self-cleaning water filters.
Water Use Efficiency:
Forsta self-cleaning filters have remarkably lower flush volumes than sand filter models. To analyze the water efficiency of a sand filter versus a Forsta self-cleaning filter, one can easily compare performance parameters using the common application of side stream filtration for cooling tower water. Take a sample side stream cooling tower application of 250 gpm. For this application, the average recommended 54 inch sand filter requires approximately 1000 gallons to backwash. For this same application a Forsta Filters D-180 uses only 50-75 gallons.
Backwash Duration and System Flow:
Sand filters require 3-4 minutes for their backwash and cause interruption to the system during that time. Alternatively Forsta self-cleaning filters take only 15 seconds to backwash and will not interrupt the main system flow during the cleaning cycle. Sand filter manufacturers may offer multiple units with a multipart system of isolation valves in an attempt to overcome this problem, however this drastically increases the cost and complexity of the system. Simple design is upheld and extraneous spending avoided by implementing a Forsta self-cleaning filter.
Space Utilization:
Frequently the engineering of a water filtration system must take into consideration a limited amount of space. Forsta self-cleaning filters have less volume consuming configurations than sand filters. For volume comparison, take the same 54 inch sand filter mentioned above. This sand filter takes up 85 ft3 of space whereas the Forsta Filters self-cleaning counterpart flowing the same 250gpm uses only 8ft3 of space. The sand filter requires special platforms, piping and often additional pumps which take up more space and limit the placement of the filter. Forsta self-cleaning filters are designed in a variety of configurations to integrate easily into existing pipelines.
Sand Loss and Degraded Quality:
During the backwash, sand beds rise up and create potential for sand to go out of the backwash pipe.
As a result of the fact that sand essentially hovers during the backwash, it never returns to its original compressed state. Over time sand canals occur and allow particles to pass through. The internal screen element of a Forsta self-cleaning filter delivers a constant and reliable degree of filtration throughout its operation.
Sand Mixture into the System:
Minor damage to a sand filter's underdrain can easily cause sand from the filter to enter into process water. Sand in the process water may cause unforeseen damage to equipment, prevention of which is the entire reason for installing the filter to begin with. Where this is of concern, sand filter manufacturers recommend installing a basket screen (which requires manual cleaning) as an insurance mechanism. Again, this is a complicated, expensive and maintenance intensive route whereas use of a Forsta self-cleaning filter is straightforward, cost effective, and entirely automatic.
Cost:
Cost examination yields an obvious price advantage of Forsta self-cleaning filters over sand filters for matching flow rates and micron ratings. For example, Forsta self-cleaning models flowing 250 gpm at the 30 micron level cost less than half of the sand filter equivalent.
Forsta Filters Inc. Engineering Department
Forsta Filters Inc. 2011 All rights reserved
About the Author
Forsta Filters Inc.
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Filed under Air Filters by on Feb 10th, 2010. 
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