Ruling on washing menstrual pads before throwing them away
Question

                Does a woman have to wash the towels she uses during her period before throwing them into the bin?.
Praise be to Allah.
    None of the scholars – as far as we know – stated that women 
    should wash menstrual pads on which there is some blood before throwing them 
    away. Rather it seems that the Sahaabiyaat did not wash these rags, and the 
    Prophet  (peace and blessings of Allaah be upon him) knew of that but 
    there is no report that he told them not to do that. Al-Tirmidhi (64) 
    narrated that Abu Sa’eed al-Khudri (may Allaah be pleased with him) said: It 
    was said: O Messenger of Allaah, should we do wudoo’ from Bi’r Budaa’ah [a 
    well]? It is a well in which menstrual rags, the flesh of dogs and rotten 
    things are thrown. The Messenger of Allaah  (peace and blessings of 
    Allaah be upon him) said: “Water is a means of purification and nothing 
    makes it impure.” It is a saheeh hadeeth; it was  classed as saheeh by 
    Ahmad, Yahya ibn Ma’een, Ibn Khuzaymah, Ibn Taymiyah and others (may Allaah 
    have mercy on them). 

    It seems that they used to throw them away when they were 
    stained with blood, otherwise the Sahaabah would not have asked about the 
    purity of the water in which these rags were found. 

    The hadeeth does not mean that they used to throw these 
    things into the well deliberately, because the Sahaabah (may Allaah be 
    pleased with them) were greater and better than that. Rather what is meant 
    is that the well was in the bed of some wadi, and when the rain came the 
    flood would carry these things and throw them in the well. 

    And Allaah knows best.