As per the Puranic story being discussed in this post Indra, after killing the demon called Vritra, acquired the brahmahatya dosha. His gulit was thereafter shared by women, earth, water and the trees.
The women as result started to have menses and they are from then on wards considered as being impure in those days of a month.
Now, water also shared Indra's guilt. So, all waters must also get impure during some days of say a month or the year. Now if it really so happens, then in those few days all pujas and other religious rites ( like sandhyavandanam etc) must be entirely stopped because without water its impossible to take bath, perform puja etc.
But, afaik, there are no such days in a year or a month when all religious rites stop due to such impurities that water has.
Question : On which days of a month/year does all water become impure as a result of sharing Indra's guilt of brahminicide?