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.
Before you replace all the sand in your pool filter, try removing approximately 1 of the top layer of the sand, replace with the exact amount of sand you removed. Normal life span of the sand is about 4 - 5 years. You may have to clean your swimming pool filter system with a special filter cleaner, check with your pool dealer for proper procedures.