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I've been doing 3 parts Ro to 1 part tap. My tap is 580ish TDS and this brings it below 200. I treat just the tap water before I mix it.
You could get a tds pen and it's quick to check if the tap and your mixtures are right.
I get a water report every couple years and the water does change here but not very much.
 

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Ive been trying to find a decent tds pen on Amazon but every single one has mixed reviews so I’m apprehensive.

What do you treat your water with before you mix?

I’ve just put some basic water conditioner in the tap beforehand then added RO afterwards


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I use prime for the tap.
Honestly the accuracy isn't important on the tds because your just trying to match your new water Each time you make it.
 
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