What is the white residue coming out of the block?
The white residue is Efflorescence. Efflorescence is a naturally occurring deposit resembling white frost that can sometimes appear on any product made with cement. This includes paving stones, retaining walls, masonry block and even concrete. This problem can cause some concern for the consumer as it temporarily detracts from the appearance of their project. While efflorescence is a temporary problem it is almost impossible to prevent. Efflorescence occurs when the water-soluble minerals contained within the product itself, mortar or backfill are dissolved in water. The minerals are then able to migrate from the block to its surface through small pours. When the moisture containing the minerals reaches the surface of the product and evaporates it leaves behind mineral deposits that resemble frost. Water from sources such as rain, sprinklers even dew can continue to penetrate the product and dissolve minerals. Causing the process to start over again for as long as there are free minera
