Whats that thing on the heater inlet

adl6009

Well-known member
Mar 19, 2015
115
Long Island, NY
It is a Ruud P-D336A Digital heater, and there is, on the inlet (out?) port is that thing in a plastic cup like screw on underneath. My old heater didn't have it, and I remember it was something that conditioned the water somehow. But I can't find it in the manual. Do I have to change it now and then? Thanks.
 
They call it the Protek Shield.


Cautions on replacing the Protek Shield:
  • STOP the pool pump before attempting to remove ProTek Shield Assembly. Failure to do so may result in damage to ProTek Shield Assembly, loss of pool water, or personal injury
  • Do not use tools to remove (twist) the ProTek Shield Assembly or the wing nut on the stud of the ProTek Shield Assembly
  • Use a strap wrench to loosen the assembly if your hand cannot do it. Do not tighten it with a strap wrench.
  • While the manual says "Rotate ProTek Shield Assy clockwise (by hand) to unscrew it from the assembly" it is a standard right hand thread that turns counter clockwise (as viewed from the bottom looking up)
 
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