White Scum Presoak is designed as a pre-soak to facilitate the removal of white scum on block, brick or concrete. White Scum Presoak followed with NMD 80 can be used to remove calcite from concrete masonry units (CMU). Used in conjunction with NMD 80, this combination will ensure the complete removal of white scum.
White Scum Presoak also provides powerful penetration and softening action of white scum. First, apply the White Scum Presoak undiluted and allow it to dwell on the deposit for five to ten minutes. Then, apply NMD 80 using an EC Jet (dilutes four parts water to one part solution [4:1] automatically) without rinsing off the White Scum Presoak allowing a five to ten minute dwell time. Finally, rinse completely with a pressure washer to get the desired results. Repeat as necessary.
This brick retaining wall suffered from severe efflorescence. White Scum Presoak, followed by NMD 80, was used to return the brick to their natural state.
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