hard water can't wash clothes clean,u can use water softer&filter.normally use activived carbon&mambrane(mo guo lu)produce pure water.if chemica element cl too much just boil 5-8 min more can take out most of cl with air stream.(that why soup 's smell better than water.)but that water can't long time later drink,because no cl to kill bactiria.
You need to be careful if you give your kids bottle water exclusively -- babies and toddlers need to get fluoride from tap water for healthy teeth development. So filtered tap water may be best.