The following are characteristics of Modernism: 1  Marked by a strong and intentional break with tradition. 2  Belief that the world is created in the act of perceiving it; that is, the world is what we say it is. 3  There is no such thing as absolute truth.  No connection with history or institutions.
Pool filter cartridges can run for about 2,000 hours for a filter pump. Usually filter cartridges have to be replaced once every 1 or 2 years. The life of the filter will be less if you enter the pool with suntan lotion, deodorants, mousse, styling gels, and other damaging chemicals.
If you keep your pool clean they're pretty low maintenance, requiring backflushing and reloading of the DE or Fiberclear powder every month or so. But at least once a year, and probably more often unless you keep your pool absolutely immaculate, you need your entire filter assembly, including the grids, cleaned. I've had to have mine cleaned twice in about 6 months. The cleaning costs $80.00 if a pool professional does it.