first question, what is the TDS of your fill water?I would not loose too much sleep over TDS unless you were having some water chemistry problems you can't solve. Then it might be an option to explore. TDS means total dissolved solids and that means EVERYTHING that is dissolved in the water--the calcium and magnesium from the hardness, the sodium and potassium from the softness, the chloride from the use of chlorine, the carbonate and biciarbonate from the alkalinity--in short, every ion that is dissolved in your water whether from the fill, the chemicals you put in, or the reactions that occur in your water.
It seems that some of the chemical manufacturers are blaming TDS for what is essentially a high CYA level problem from using trichlor exclusively (or as a twist on that---a high salt level from NOT using their trichlor exclusivlely and using liquid chlorine!--I've seen it both ways!).Unfortunately many 'pool store guys' just don't have a grasp on what is going on in a pool and everything that they know is what the manufacturers tell them. My pool tests out at over 4000ppm TDS! about 3200ppm of that is the salt for my SWG, abut 150ppm is the calcium that I add, etc. I f you don't have any problems enjoy your swimming. Your numbers look like they are pretty good (what is the pH?). BTW 5 ppm is what many on here recommend as the lowest to run your FC with a CYA above 60. Check out this post:
http://www.poolforum.com/pf2/showthread.php?t=365
Happy swimming!
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