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The screen is inside the inlet to the solenoid valve, #5 in the attached file.  I thought it was missing until I stuck my finger in there & felt it.  I cleaned it & let it sit in white vinegar which dissolved the remaining deposits.  I couldn't find a 90° union so I used a 1" Sharkbite 90° fitting.  I can pop it off the next time the screen needs to be cleaned.  There's no room for a straight inline union.

This was done with the mid-bath.  The rear bath isn't going to be a walk in the park either.

Ahh on the toilet, not the pump!

I have a microphor so I would assume it’s different. Knock on wood my microphor works!