The initial capital cost of a Defender media filter is more than a sand system but is quickly offset in operational costs savings – often in less than a year. The smaller Defender system saves on construction costs, water and waste costs, energy and chemical costs as well as power costs.
No, there is no pool size limit. Defender filters may be installed on 70 – 2500 GPM (single filter) pools and spas. Multi tanks can be installed in tandem to accommodate higher flow rates.
Defender filters are programmed to complete the automated regeneration cycle daily and it will take no longer than 10 minutes. This includes the “bumping” step and agitating the media. (See also “Bumping”)
“Bumping” is the mechanical movement of the tube sheet which forces water into the tubes, evacuating the media from the surface of the tubes, sending it into suspension. It is accomplished by mechanical movement of the septum up and down within the water in the filter housing. This motion expels the media and dirt particles from the septum and into suspension. This allows the filter elements to receive a fresh coating of perlite once it re-attaches itself to the tube elements. Defender filters are programmed to bump daily and will take no longer than 10 minutes to complete.
Every Defender system is designed to be fully automatic but is operable in semi-automatic mode which requires the push of a button to initiate the automatic filtration and bump cycle.
The Defender system's programmer includes auxiliary contacts to control all peripheral devices.
The complete filter cycle using the same charge of perlite usually averages 4 weeks depending on bather load. Some pools may go months in the off-season.
Eliminating used media and recharging with new media in a single Defender system takes 15 – 25 minutes.
