Sap, even in cold weather, should not be left in buckets for more than two days. Microbial actions will result in spoiled sap. This will have to be discarded. If sap spoils, the bucket should be cleaned if possible. USe the 1 to 20 bleach to water solution. When collecting sap, it is important to remember that sap is heavy. During a good flow, even ten trees will produce 160 pounds or more of sap. Sap will have to be transported from the trees to a storage tank. A five gallon plastic bucket is often the best mode of transportation to the storage tank. For small operations, the buckets can be carried to the storage tank (large sterile garbage cans) near the evaporator and dumped. For larger operations, some other transportation will be needed.