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.
For most spas under halogen treatment (chlorine or bromine), I recommend that the spa filter cartridge be replaced every 12-24 months, depending on itâs size, and on how much the spa is used. For those who wish to go chlorine free in the spa or hot tub, Iâd recommend that you double the frequency, and replace your spa filter every 6-12 months.