Whoa whoa! Lose the chlorine remover- if it's the stuff I'm thinking of that is made for aquariums, it's NOT going to be good for your plants- it precipitates unwanted chemicals out and they are meant to get stuck in the fish tank filter, but in the case of hydro, can interfere with your other nutes instead.

Autopot? Like a self-watering pot? That's a hydroponic technique and you should be checking the pH of your reservoir. Since it is passive/wick style, there is no 'runoff'. I don;t recommend this method for cannabis. Look into a drip system instead if you are using perlite as your substrate.

Optimal for hydro is between 5.5 and 6.3. I set my hydro at 6.0 to allow for slight fluctuations in either direction.

Read up in the hydro section to see what people are using and what problems they are having, and how they fix them. DWC, ebb n flow, and NFT are all easy methods for beginners to learn hydroponics. There are some neat links in the 'styles' sticky at the top of 'basic'.