Foam cannon and hard water

Interested in this as well, as my well water is quite hard and my black car makes sure I know it.
 
Ok, so I tried it with softened water form inside and made a huge difference in foam output. Now it's much more like in the videos with 4oz soap. Although, when I do rinse with the soft water, the water doesn't flood off the car like it usually would.
 
Has anyone had any success with the inline water softeners that autogeek sells?
 
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