We have model number C7020STAMN. Filters are listed as CX590REM on the label. About three years ago, the person who was taking care of our pool replaced our old system with this model. He told us it was barely used, and we paid about $700 for it. Our current person has cleaned the filters every six months. He now says they are worn and need replacements (all 8 of them). Do you carry these filters and if not, where can I get them. How much to they cost for all 8 together? Thank you