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heavy usage, oils lotions can easily clog up a fibre filter inside a month Ive seen it.
After removing the filter, I turned the power back on and let the tub run for about an hour. No FLO error signal, just a flashing COOL and the temperature which is normal according to the manual. So if I knew these filters longevity was so short lived, I probably would have chosen a different manufacturer. The manual does say to replace filter every six months or as needed, but having to change two filters within two and a half months seems excessive. I have left a message for the service tech from the company I bought the spa from, so hopefully I will get to speak to him on Monday....Thanks to all who have offered advice.-62VW