Thats just the problem google gives lots of conflicting advice, plus most seems more concerned with weather proofing than anything else. Overall the tub looks good, has a few little dings in the cabinet, I have replaced a few parts (circulation pump (twice), spinner jet (bearings were shot), diverter rebuild, pillow, ozonator, etc.) Otherwise things are still mostly good, people that see it never guess its age, it has the IQ-2000 controller so is not too ancient (1st year of the control panel style that ran through about 2008), only problem is since last summer the tub light is stuck on all the time regardless of what the control panel says, so I un hooked it. I never used the light anyway, so it really was not worth spending $400+ on a new control board.