Re: Chlorine Won't Hold
First of all your TDS is NOT the problem but your high CYA which is way over 100 ppm from what you have described is a big part of your problem.
I suspect that you might have ammonia in the water from degredation of CYA and if this is true it will take a LOT of chlorine (use bleach!) to get rid of it. However, since the CYA is also so high partial drain and refill will not only dilute the CYA but also the ammonia.
I would suggest getting an inexpensive aquairium ammonia test kit and seeing if that is the problem. Report back here once you get the results. Pool stores do not test for ammonia since they do not have a product they can sell you to remove it!
I would also suggest getting yourself a good test kit and start testing your own water and getting away from the Bioguard pool store you are freqenting. Their testing method (ALEX) is designed to sell more chemicals, not balance your water!
Retired pool store and commercial pool maintenance guy.
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