Does passing wind invalidate ablution if it is without sound or smell? And how can purity be determined after the menstrual cycle ends if neither the white discharge nor dryness appears? What is the ruling on continuous white discharge that is neither sticky nor watery?

If a wind (gas) exits the anus, ablution is nullified, even if it has no sound or smell, as long as the Muslim is certain of its emission. If the emission of wind is constant most of the time and causes hardship, it is treated like سلس (incontinence). However, if it is merely a doubt or imagination, it has no effect on the validity of ablution.

A woman recognizes purity from menstruation by one of two signs: by seeing the white discharge (قصة البيضاء), or by complete dryness, which means inserting a cotton swab and it comes out clean with no trace of blood. It is not permissible to rely on an estimate of six or seven days, due to the possibility of the bleeding stopping before or continuing beyond that period.

The persistent white discharges are from the vaginal secretions (رطوبات الفرج), and they are pure (tahira) but they nullify ablution.