The Temple Institute: In-Depth Temple Study: The Yesod: The Base of the Mizbeach
 
The Yesod: The Base of the Mizbeach: Uses

The blood of the first-born cattle, tithes and Passover offerings was dashed once upon the base of the mizbeach. This could be done at any spot along the western or northern base. On the southwestern corner of the base, were two small holes into which the remnants of blood were poured after the dashing of the offering's blood. In the western hole the blood from the inner sin-offerings was poured, and in the southern hole the remnants of blood from the other offerings. This blood drained out along the aqueduct that led to the Kidron River base. Jerusalemite farmers redeemed the holiness of the blood by purchasing it. They would use it as fertilizer for their fields. 
Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII