Everybody knows what a sacrarium is as found in a sacristy - the extra sink with the drain not into the sewer, but into the soil.
In addition, one always sees this type of drain in Rome, too. They made these in the floor of most every sanctuary, always next to the credence table, near the main altar.
In this manner the lavabo dish and the cruets could be poured out in a reverent manner after the service into the soil instead of into the sewer.
Such detail to reverence! Now can we do the same in our pockets of the world?