I have converted a few systems like that to 3 pumps and put an air solenoid on each pump and removed the solenoids on the tank they always seem to be problematic.Thanks again for the helpful replies. I just took a few photos to show the current setup. If I can’t find a solenoid that works, it sounds like switching chemicals is the next best option. Any additional suggestions are appreciated!
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A KIP valve wouldn't be a good choice to use with a high PH product. A High PH product will eat up Stainless steel pretty fast.
I think several here use JBS glow foam polish which is available at Kleen Rite.
I use Warsaw 721 R, B, & Y...TF Polish. I've never had an issue with the 1/2" brass GC solenoids at the tanks or the brass kip manifold that directs chemical to the bays. Been installed over 10 years and haven't changed the first solenoid.