U will bro the key to sps is steady alk imo and balance when using a cal reactor everything is balanced and steady just remeber when adjusting go slow and give it time steady out before u take Ur readings ,I did one adjustment a day to the flow ,then waited checked it the next day and made another adjustment ,
ok i got two parts of the puzzle today another ph probe and pm-1 module for the apex and the pump just need the tank and regulator looks like i might be spending the 150 LOL
make sure you get a great regulator. dont cheap out on it. im about to spend 300 on one in the next few weeks. saw it at damianos house and i need it LOL