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.
Unless you mean how to you change the sand in a sand filter. This is done by removing the multi port control fr â¦ om the top of the unit sucking out the sand with a venture made for the occasion (ask your pool shop) and replacing the sand. This needs to be done about every 3 to 5 years.