MD, I'd be hesitant to adjust calcium hardness and alkalinity as your builder may be doing a high-acid startup on your pool. Depending on the finish (pebble, plain plaster, exposed quartz, etc.) there may be specific manufacturers requirements that you can muck up (the DiamondBrite high-acid startup, for example, requires a TA of zero). You don't want to void any warranty you might have (and some contractors will use any excuse, no matter how bogus, to do just that). I recommend that you talk to your builder and or plasterer before doing much of anything with the water chemistry.