You can use 3 lbs per gallon of water added in the refill cycle. That cycle usually runs at .5 gpm or 1.5 lbs per minute.
I've repaired hundreds'n hundreds of 155, 255, 168 Autotrol valves. I'll say it again; You should get a fairly strong suction. If not something is wrong like a kinked/blocked drain line, injector, injector screen, loose brine line connections allow it to suck air, low main line water pressure etc. etc.. I used to use a smoking pipe cleaning brush through the port from the injector screen to the injector.
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Gary Slusser
22 yrs in water treatment and well pumps, 13 yrs helping people on the 'net to help themselves.
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