First off, welcome to the forum!
Secondly, stay out of the pool store unless you have money you don't want. Then, they'll be the place to help you out with that problem!
Your CYA is extremely high at 100. As a result, unless you run extremely high cl levels, your pool is gonna get algae. With low cl levels like you have, you most certainly must have an algae bloom brewing even if you don't have a green pool. That is one reason why you can't keep chlorine in the pool -- it is being used up fighting something in your water.
Give us some more info. What type of pool and what is the volume? What type of filter? Also, tell us exactly (meaning ingredients, not product names) what all you have put in the pool and when. If you haven't done so yet. don't add any of that stuff until we get some more info from you.
BTW -- FC + CC = TC so there is a problem with your chlorine numbers. Did the pool store test or do you have a kit and if so, what type?
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