You need to raise your ph asap, if it is testing under 7, it may be lower. Using the pucks will bring down your ph all the time. You need to add chlorine to get up to shock levels, here is a chart:

Stabilizer . . . . . . Min. FC . . . . Max FC . . . 'Shock' FC
=> 0 ppm . . . . . . . 1 ppm . . . . . 3 ppm . . . . 10 ppm
=> 10 - 20 ppm . . . . 2 ppm . . . . . 5 ppm . . . . 12 ppm
=> 30 - 50 ppm . . . . 3 ppm . . . . . 6 ppm . . . . 15 ppm
=> 60 - 90 ppm . . . . 5 ppm . . . . . 10 ppm . . .. 20 ppm
=> 100 - 200 ppm . . . 8 ppm . . . . . 15 ppm . . .. 25 ppm

here is a link to a calculator that is very helpful:
http://www.hal-pc.org/~mwsmith2/BleachCalc262.exe

You will have to add some stabalizer cya) to get it to around 30 - 40 (the pucks will raise your stabalizer). So if you plan to use your inline feeder, don't take your cya up higher than 30, and you will have to keep an eye on the amount of chlorine you need compared to the amount of cya you have.

So raise your ph using borax because your alk is good. Put in a box, wait 2 hours test again, and add to get it up to 7.4

Shock the pool up to 12, and you will be good to go. I would also suggest you get a good test kit - it makes taking care of your pool a whole lot easier. The test that is sold on this site is really good.