The same basic ideas in Savings With Good Etchant Control also apply to feed and bleed solder stripping processes based upon a 30% nitric acid solution. In the solder stripping case there are additional saving factors worthy of consideration. The solution is much more expensive per gallon. This makes the cost of solution drag out on the boards leaving the reaction chamber much more important. It is desirable if the solution lost this way have as much dissolved solder that the solution can hold so that it is nearly exhausted anyway and near to being pumped out. If the process control is tight then the sump chemistry can be kept near maximum metal content to minimize the cost of drag out loss. Another factor with solder stripping process is that the existing process is sometimes a periodic manual batch dump and not an automatically controlled feed and bleed. Solder content in the sump solution in a manual dump process is likely to vary much more than one ounce per gallon significantly increasing the cost of drag out loss. The manual system also has higher labor costs and makes extra work for talented process control people.