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.
FILTRATION: Another potential scenario may be that your pool filter is not doing its job. The filter media could be worn, or water could be bypassing the filter media, and returning to the pool unfiltered. SAND: If your sand is more than 5 years old, or has never been changed at all, then it should be changed.