Short cartridge filter run time

I am using a 175 ft2 Hayward cartridge filter, what is the process for "deep" cleaning this filter. Rinsing with water hose removes the debris, but can you do anything
to remove the dark stains and really clean the media??? I am new to the site, but have alredy learned tons of info never before seen or heard of, especially at my local pool store. Received my TF100 test kit in the mail yesterday, can't wait to get my first set of "accurate" test results.....Thanks in advance
 
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