All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions.
The excrement expelled from your body and drained into the nylon pouch nullifies your Wudu’ (ablution), whether secreted in small or large amounts. Like a person who suffers from urinary incontinence and a woman with Istihadah (abnormal vaginal bleeding outside the menstrual or post-partum period), you should perform Wudu’ as a prelude to every Salah. You are, however, pardoned for
wearing during Salah this waste-collecting pouch containing Najasah (impurity) and for your excretion of fecal material voided into the pouch during Salah. However, it is not permissible for you to lead others in Salah, be it obligatory or Sunnah (supererogatory).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.