It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Water is from water."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 787
Sayyiduna Ali (may Allah be pleased with him) says: I asked the Messenger of Allah (peace and blessings be upon him) about madhi (pre-seminal fluid), and he (peace and blessings be upon him) said: "When you see madhi, perform ablution and wash your private part; and when you see the water gushing out, perform ghusl."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 788
Sayyiduna Ali (may Allah be pleased with him) says: I used to have a great deal of madhi, and when the Messenger of Allah (peace and blessings be upon him) learned that the water was causing me hardship, he (peace and blessings be upon him) said: "Ghusl is only from the gushing water."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 789