Hey! Welcome to TFP!! I see you are a new pool owner.
I'd recommend that you read through this (click the link) -->
Pool Care Basics
Using pucks is ok, but understand that they add Cyanuric Acid (CYA) to the pool, in addition to chlorine. The more CYA you add to a pool, the more Free Chlorine (FC) you need to sanitize. At some point you add enough CYA that it is almost impossible to maintain enough FC to sanitize your pool. Here is a must read on CYA -->
FC/CYA Levels
When your CYA gets too high, the only way to remove CYA is to replace water in the pool.
Do you have a test kit? Do you know your CYA level? If you don't have a test kit, get one now! -->
Test Kits Compared
I would get your test kit and figure out what your CYA level is before adding more pucks. It is best to use liquid chlorine to maintain chlorine levels until you get your test kit and know your CYA level. I would say a large percentage of people that come to TFP come here because their CYA got too high on pucks (pun intended), couldn't maintain enough FC and ended up with a green pool and algae.
Ok, having said that, the way to use that chlorinator effectively is to have a test kit. It is a bit of trial and error. You can put up to as many pucks in the chlorinator as it will hold (you may just want to start with 2 pucks until you learn how it works). You would change the dial, wait a day and test. If your FC is high enough per the
FC/CYA Levels you are good. Low, you would turn the dial up and test after another day. High, you turn the dial down. At some point you will hit a point where your FC remains stable, until the CYA starts to rise and you will have to turn the chlorinator up to maintain the FC/CYA ratio. Again, to keep you away from a green pool, I recommend using liquid chlorine until you know your CYA level.
A good tool to have in your back pocket is pool math. It will help you with what and how much of all chemicals to add -->
PoolMath
But to use Pool Math effectively, you need a test kit.
Hope that helps!
