Not an expert by any means but I've read alot on this site.

Without knowing if you have any CYA (I'm assuming you don't) in your pool you would put between 1 and 1.5 cup per day to raise your Cl level to 2 -3 ppm if your level is dropped to 0 everyday by the sun and organics. Ideally you should always have between 1-3 ppm of Free Cl at 0 CYA to maintain proper sanitation.

Get the BleachCalc.exe enter your 1700g and desired cl ppm increase and the program will give you the amount of bleach needed.