In 1996, the Congress approved legislation that toughens federal regulations designed to protect the nation's drinking water. Subsequently, the President signed the bill to authorize 2.6 billion dollars over seven years to improve deteriorating municipal and rural water systems.
Part of this comprehensive legislation calls for the EPA to establish more stringent standards to control cryptosporidium, giardia cysts and other common drinking water contaminants that pose significant risks. Cryptosporidium is the protozoan that reportedly infected over 400,000 people in
Milwaukee, Wisconsin, resulting in a significant number of deaths related to the outbreak. To date, the best known method to control cryptosporidium and giardia cysts in water is through the use of microfiltration, or employment of absolute rated filter cartridges fine enough to remove cyst sized particles. Surface waters are most susceptible because animals live nearby, contributing to the cyst population found in water. For this reason the Surface Water Treatment Rule was established to regulate drinking water taken from reservoirs, lakes, rivers, ponds, and streams.
For Cyst-Free Drinking water
Absolute rated POLY-PLEATT cartridges meet or exceed the three-log (99.9%) removal requirements described in National Sanitation Foundation Standard 53 for cyst sized particles.
Independent Lab Validated
To demonstrate the performance of POLY-PLEATT cartridges and HARMSCO filter housings, Analytical Services, Inc., a highly respected independent testing facility, was selected to conduct challenge studies using live organisms. The challenge system was composed of a reservoir, pump, static mixer, pressure gauges and challenge bleed-off assembly. The test protocol has been reviewed and approved by leading states in the country and is considered the most stringent method used for cyst reduction testing. The protocol includes two separate spikes on different but identical test filters using live giardia lamblia cysts
For this reason, POLY-PLEATT filter cartridges are ideal to control cryptosporidium, giardia cysts and other harmful micro-organisms to help ensure cyst-free drinking water.
and cryptosporidium parvum oocyst. An initial giardia/cryptosporidium spike is performed early in the filter run to document the filter's efficiency. After injection of the challenge organisms, test samples are collected in two phases during an uninterrupted 36 hour run. During the first sampling phase of 1-18 hours, calibrated side-stream samples were collected from both the influent and the effluent of the test filter. Because no cysts are injected during the second phase, only effluent samples are collected during the 19-36 hour test period. Results of the 19-36 hour challenge tests are as follows: