The only way to lower a calcium level is to do a partial drain and refill but you have to be careful draining someplace where the water table may be high or else you can float your pool right out of the ground.

The other thing I see is your reported CYA reading of 100 which means it could be much higher than that since 100 is as high as the tester can read. I'm sure you know to run higher than normal chlorine readings as a result (per the Best Guess Chlorine Chart in my signature below) or else you'll have algae problems. I don't know what the best solution is for you. Normally, when someone has a CYA reading that high, we say discontinue any forms of stabilized chlorine meaning no more trichlor tabs. But, since you aren't around to do daily checks on your pool chemistry, that limits your options.

Do you have a pool service and if so, how often do they check your pool?

I'm going to ask Ben to pop on here and offer his nickel's worth to see if he has any good suggestions for you. Good to see you back around the forum this year!