Welcome to Shiloah Ministries!
(S)Why did Jesus send the blind man to the pool of Siloam to wash in order to receive his sight? Well the pool of Siloam was fed by a conduit made by Hezekiah, King of Judah (726 to 697 BC) in order to bring water into Jerusalem from outside the Holy City. These waters called "the waters of Shiloah", ran quietly and unseen and as such they formed a type of Immanuel Whose unceasing flow of love and power had from the beginning been the unseen source of Israel's strength.
"Inasmuch as these people refused The waters of Shiloah that flow softly,
and rejoice in Rezin and in Remaliah’s son;
Israel instead of trusting in Immanuel, and His unseen but ever present power, preferred to trust to an alliance between their King (Pekah, son of Remaliah) and the King of Syria (Rezin).
Jesus's act in causing the blind man to wash in the Pool of Siloam before he could receive his sight is therefore a sign to every Israelite in the present day that, when the nation refused Hezekiah's invitation to return to the God of their fathers, they were in fact refusing Immanuel Whom Hezekiah represented and typified.
By washing in the pool of Siloam the blind man signified that he no longer refused the "waters of Shiloah" which speak of Immanuel's power. Directly he had done so, he received eyesight. But not only so, for the veil fell from his heart and he instantly stood in bold defense of the One Who had healed him.