Part 1: The Seven White Days and the Laws of Harchakos Part 2: The halachos of Niddah and Hefsek Tahara Part 3: Halachos of Calendar - The Onas HaVeses Mrs. Chaya M. Klein Review of the halachos of the calendar and the Onas HaVeses. Learn how to calculate the onos of separation based on your cycles and the halachos (Jewish Law) as part of the observance of the Laws of Taharas Hamishpacha. Part 4: Chafifa and Tevillah Additional notes relating to part 4: 1. It is best to take a haircut at least three days before immersion to ensure removal of all bits of hair that may remain 2. We do not postpone mikvah from Thursday night to Friday night because a husband is away. Rather immersion should take place on Thursday night and wife should sleep with a knife under her pillow. Please consult your rav whenever mikvah may be postponed. Sara Morozow & Chaya Klein An in depth review of the laws of Taharas Hamishpachah in this four part series