One of the most common causes of failure is sometimes referred to as the âcreeping crudâ or âold-ageâ or Biomat failure. Several factors contribute to the development of the biomat; time, wastewater strength, hydraulic load, groundwater saturation, and maintenance are the major ones.
Please exercise caution, and wear a mask over your nose and mouth to reduce the impact on your health. Removing Mold and Mildew growth from the Outside of a Dry Book: 1  If you can perceive growth on your book's cover, you may use a fine brush or very soft cloth to gently brush away the mildew.lease exercise caution, and wear a mask over your nose and mouth to reduce the impact on your health. Removing Mold and Mildew growth from the Outside of a Dry Book: 1  If you can perceive growth on your book's cover, you may use a fine brush or very soft cloth to gently brush away the mildew.
Instructions. Sand off the old stain or paint on the bookcase. Always sand in the direction of the wood. Use 220-grit sandpaper to ensure you remove all of the old stain, including the edges and corners of shelves. Wipe down the bookcase with a wet cloth to remove any remaining wood dust.Tidy the general area with a vacuum cleaner.Mix stain with a wooden paint stirrer.lways sand in the direction of the wood. Use 220-grit sandpaper to ensure you remove all of the old stain, including the edges and corners of shelves. Wipe down the bookcase with a wet cloth to remove any remaining wood dust. Tidy the general area with a vacuum cleaner. Mix stain with a wooden paint stirrer.