Apex Controller

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I am looking at purchasing the Apex controller , and I am not sure all what I need to buy as far as equipment.
Here is what I have:
1AI Sol
2MP10 W
1Litermeter Auto Water Change Top off
Calcium Reactor
Maybe a Phosban Reactor
Carbon GFO Reactor

Wanto check PH, Salinity

Appreciate the assistance.
Thanks