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If your Clack WS1 Valve does not appear to be drawing ( sucking in ) the salt water from your brine tank, then here is a list of things to check and information about Brine Suction Failure.
see:
Brine Tank Overflow

And this is the LIST of things that Clack says to check......
NOTE: The primary cause is "Wear" to the Seals & Stacker Assembly...... as ALL the "seals" are part of this one large item.
see:
http://www.softenerparts.com/Spacer_Stack_Assy_for...

Excessive water in the regenerant tank / Control valve fails to draw in regenerant



Check to see if the Valve is creating the required Suction.

Remove the Brine fitting at the Valve and manually advance to the Brine Rinse cycle... you should have suction that you can hear and feel at the brine connection of the Valve.
If you do not.. there is a problem with the Valve ( injector, seals & stacker, drain flow ).
If you do have suction, then the problem is Not with the Valve, but has something to do with either the Brine tubing, connections, or the Brine Pick Up tube in the salt tank ( is that new or old ? As it's possible for the Brine Pick Up to be blocking flow out due to pre-mature "air check".. rare, but something to consider if Valve is working and connections are all good ).

And if the problem is the Brine Pick Up Float Shut off see this replacement,
Brine Pick Up with Float Shut

Check all connections from the Valve to the Brine Pick Up Tube.
Do you have the required "ferrule" on the brine tubing, as that is what creates the "seal" and not the threads of the fittings.

And last but not least, on an older systems that has been using Pellet type salt for many many years, you can have a blockage at the bottom of your Brine tank created by old un-dissolved salt.

For Clack parts,
http://www.softenerparts.com/Clack_WS1_Valve_Parts_s/45.htm

For Clack rebuild video,
http://youtu.be/LOvr-5coUhE

A couple short videos that show how to check things on the trouble shooting chart above,
https://youtu.be/Zikmilf_Tu0
or
https://youtu.be/eT2Dp-Q8Sgg

For list of Clack parts we stock for immediate shipment,
see: http://www.softenerparts.com/Clack_WS1_Valve_Parts_s/45.htm