If a menstruating woman puts her hand in water, does that make it najis?
Question

                My wife had her period and a piece of soap fell in a bucket of water, so she put her hand in the water to take out the piece of soap and she forgot to tell me about that until after I had done ghusl. Is this water regarded as najis or nor, and should I repeat my ghusl or not?.
Praise be to Allah.
	The basic 
	principle concerning water is that it is pure and a means of purification, 
	and this description is not cancelled out unless some impurity falls into it 
	that changes its colour, taste or smell; in that case the water is deemed to 
	be najis (impure). 

	The fact that 
	a woman who was menstruating put her hand in the water does not affect the 
	water or make it impure, because the body of a Muslim is pure (taahir) 
	whether he is junub or whether a woman is menstruating, because of the 
	report narrated by al-Bukhaari (276) and Muslim (556) from Abu Hurayrah, 
	according to which he was seen by the Prophet (blessings and peace of Allah 
	be upon him) on one of the streets of Madinah when he was junub. He slipped 
	away and did ghusl, and the Prophet (blessings and peace of Allah be upon 
	him) noticed that he was not there. When he came to him he said: Where did 
	you go, O Abu Hurayrah? He said: O Messenger of Allah, you saw me when I was 
	junub and I did not want to sit with you until I did ghusl. The Messenger of 
	Allah (blessings and peace of Allah be upon him) said: “Subhaan Allah! The 
	believer does not become najis.” 

	An-Nawawi (may 
	Allah have mercy on him) said: This hadeeth sets out a great principle, 
	which is that the Muslim is pure in life and in death. In life he is pure (taahir) 
	according to scholarly consensus…

	End quote from
	Sharh Muslim 

	He also said: 
	The scholars said: It is not makrooh to lie down with a menstruating woman 
	or kiss her… And it is not makrooh for her to put her hand in any liquid … 
	Her cooking, dough and other things she makes are not makrooh; her leftover 
	water and sweat are taahir (pure). There is scholarly consensus on all of 
	that. Imam Abu Ja‘far Muhammad ibn Jareer narrated in his book on the 
	madhhabs of the scholars that the Muslims are unanimously agreed on all of 
	that, and the evidence for it in the Sunnah is clear and well known.

	End quote from
	Sharh Muslim 

	Al-Khuraqi 
	(may Allah have mercy on him) said: If a menstruating woman, one who is 
	junub and a mushrik dip their hands in water, it is still taahir. 

	Ibn Qudaamah 
	(may Allah have mercy on him) said: With regard to the purity of water, 
	there is no confusion concerning that unless there is anything impure on 
	their hands, because their bodies are pure and what they are do not imply 
	that their bodies are najis. Ibn al-Mundhir said: The majority of scholars 
	are agreed that the sweat of one who is junub is taahir. That was proven 
	from Ibn ‘Umar, Ibn ‘Abbaas and ‘Aa’ishah (may Allah be pleased with them) 
	and from other fuqaha’. ‘Aa’ishah said: The sweat of the menstruating woman 
	is taahir. All of that is the opinion of Maalik, ash-Shaafa‘i and ashaab 
	ar-ra’y, and no difference of opinion has been narrated from anyone 
	else.

	End quote from
	al-Mughni, 1/135 

	Based on that, 
	your ghusl is valid and there is no need to repeat it. 

	And Allah knows best.