How to program ATO+Kalkreactor

[Beuchat]

Hi Support,

I am trying to program a Kalkreactor to dose when pH drops below 8,3 in the tank. The water coming from the RO system enters the reactor and goes into the sump when ATO is activated. I do not want any Kakwasser to enter the sump when pH is above to 8,3.

So I have built a split using to electrovalves which shall be activated depending on pH value and only when ATO is active. Valve 1 will be active when pH is below 8,3 and valve 2 when its above 8,3

The programmable logic I have use is as shown in graphics

But it does not work

Is it bad implemented or a better way to do it?

Thanks