FIRST I WONT TO SAY THAT THE PEOPLE AT AERO SPA ARE EXCELENT IN CUSTOMER SERVICE I TALKED TO THEM ABOUT HARD WATER PROBLEM AND THEY GOT BACK TO ME QUICKLY AND WITH AN ANSWER SO IT DO'S NOT GET ANY BETTER. NOW IF YOU WANT VERY LOW MAINTAIN THEN THIS IS IT. YOU MUST TIME THE AERO SPA WITH YOUR FILTER CYCLE OF THE HOT TUB AND THAT IS IT AND YES IT IS THAT SIMPLE PERIOD