Power SavingsDefender® reduces head loss (vs. sand) to save motor horsepower operational cost. Starting differential pressures for a high-rate sand filter, depending on the media, could range from 4 to 6 psi (27.6 kpa to 41.4 kpa). In contrast, the starting differential of the Defender® is approximately 1 psi (6.9 kpa). Converting this to head represents savings of nearly 12 feet (3.65m) total dynamic head, or TDH, which translates to horsepower and energy savings. In most cases, the pump motor required for Defender® filter recirculation is smaller than a sand filter. Utilizing a 25hp motor instead of a 30hp unit would result in electricity savings of $3,000 per year. In waterparks with multiple attractions, the savings would be much more. Defender Technology Delivers Huge Energy SavingsThis graph illustrates the actual operating pressures of High Rate Sand Filters compared to Defender Regenerative Media Filters. The RED line represents the fluctuations in PSI for High Rate Sand Filters throughout one complete filter cycle (3 days). The BLUE line indicates the PSI differential for Defender Filters over a similar cycle (21 days). As a result of the “Bump” cycle, the Defender operates at a dramatically lower head pressure and vastly reduces energy costs. The GREEN shaded area represents the level of lower head requirements which translates directly to dollars saved.“Defender Technology Delivers Huge Energy Savings”
A High Rate Sand Filter, designed at 12 GPM/SF will typically start with a 5 PSI pressure differential, when clean. A pressure differential increase of 10-12 PSI occurs every 3 days, requiring backwashing. A Defender Filter, designed at 1.3 GPM/SF, will typically start with a 1 PSI pressure differential with new media. Daily pressure differential increase will be 0.25 PSI after bumping. A typical 21 day cycle has yielded a 5.5 PSI pressure differential increase. All data is provided by Great Wolf Resorts based on actual results of filter systems they operate at various facilities in North America. |
“We choose the Defender® filters because of the water savings and water quality they’ll provide for our park. Defender® filters can filter particles down to 1 micron in diameter which decreases the risk of recreational waterborne illnesses such as crypto.” Peter Kowny 
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