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The replacement of Fleck's 8500/TwinFlo 100E Control Valve with the 9100 Twin Tank Control Valve will be effective July 6, 2010. 
The 9100 Control is a high-performing, competitively-priced alternative, with more options and functional capabilities than the 8500 model. 
Pentair Water has stopped supplying Fleck 8500 Control Valve service parts.  

* The TWO resin tank valve you could use is the Fleck 9100,
see here.
electronic controlled version here:

** YOU COULD install a Valve ( like Autotrol 255 or Fleck 5600 Econominder ) on just ONE of the two Resins tanks,
and use it that way.

Twinflo 100E Service Manual

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