Welcome to TFP!!!
First, forget about algae killer, phosphates, nitrates, and all the other buzz words and potions.
How did you get a CYA value of 106ppm?
Do you have one of the
Recommended Test Kits?
Yes, you most certainly need to follow the
ShockLevelAndMAINTAIN Process. But, if that CYA is correct, you need to replace half of your water first.
Have you discovered
Pool School? I suggest you take a look at these to be sure we are speaking the same language:
ABCs of Water Chemistry
Recommended Pool Chemicals
How to Chlorinate Your Pool
Also, Please add your location (City, State or City, Country) to your profile and pool details to your signature as described
HERE as it will help us help you.