Unable to maintain chlorine levels

[Poolsean]

Before everyone jumps on the "your chlorine level is too low for the cya level you're maintaining", my two cents worth of advice is this:
You have a high chlorine demand SOMEWHERE, and the only way to get rid of this is to satisfy the demand. This means continually adding chlorine to maintain a high residual until you see the residual maintaining. With cya in your pool, you should be able to maintain the residual for 2-3 days before it dropping off.
I'd recommend using just regular bleach to add EVERYDAY until corrected.
Check your filter to make sure you're not harboring algae in there.

Have you needed to add any chemicals for algae? Most sodium bromide based algaecides require that you add an oxidizer (some form of chlorine) to activate it, and to repeat the dosage several days later. This can affect your chlorine tests.

With salt generators, I recommend maintaining 5-7 ppm (you can go higher if you want) with the system turned off, for a week or two, whenever sodium bromide is used in a salt generator pool.

[medstudy]

I like the idea of bleach, sounds cheap. How do I add bleach? Any particular kind? How much?

[waterbear]

medstudy,
Welcome to the forum.
You are in the right place to learn about bleach, borax, and baking soda and how to maintain your pool without breaking the bank! (and having the best water in the neighborhood). I am totally serious about this! I would suggest you go to the sister website of this forum www.poolsolutions.com and read EVERYTHING on it that you can (some sections are subscriber only), then come back here and and read the FAQs and stickies at the top of each forum subheading. You will then have a good idea on the BBB method of pool care. Anything you don't understand just ask...there are plenty of members here who can guide you!
BTW, I know you posted the same question in another forum. I answered you there. IMHO, THIS forum is the place you will find the answers you are looking for without the misinformation so prevalent in the pool industry!