I've been using the BBB method so far this summer. In years past, used trichlor tabs which has resulted in CYA over 100. Now, we're planning to go away for a few days & I'm not sure what to do. I saw HTH 3-in-1 cal hypo tabs (calcium level is only 50, plus I have a vinyl liner anyway), but have read that they contain copper.

Please help!!! Any suggestions?