FILTER FEED PUMPS Filter Feed Pumps are used to draw water from the clarified water sump and pass it through the Pressure Sand Filter (PSF) and Activated Carbon Filter (ACF), which are installed in series to improve water quality. PRESSURE SAND FILTER (PSF) Working Principle: The upper layers of sand perform the actual filtration function, while gravel layers provide physical support. Specialized sand with a specific particle size is used to trap solid impurities present in water. The particles get entrapped in the spaces between sand grains, eventually blocking water flow. When the pressure drops beyond a set limit, the sand is cleaned by backwashing with water. Backwashing reverses the flow, fluidizing the sand bed and removing lighter solid particles as waste. Operation And Maintenance Considerations Filtration is followed by a short backwash sequence. The filter requires backwashing when the pressure drop across the filter reaches 0.5 kg/cm². Best practice: Backwash once per shift,...
Introduction Granite, marble, and tiled surfaces add elegance to any space, but they require proper maintenance to retain their shine and durability. This Standard Operating Procedure (SOP) provides step by step instructions for daily and weekly cleaning of these surfaces to ensure a spotless and polished finish. Objective To establish a systematic and effective procedure for cleaning and maintaining granite, marble, and tiled surfaces without causing damage. Responsibility Janitors are responsible for ensuring the cleanliness and upkeep of these surfaces using the appropriate cleaning techniques and products. Surface Cleaning Procedure Daily Cleaning Steps Dust Removal Use a dry mop to remove dirt and dust from the surface. If required, repeat the process after dusting off the dry mop. Wet Mopping for Deep Cleaning Use a wet mop with Taski R2 (diluted: 20 ml in 1 liter of water) to clean marble and granite surfaces. Ensure the mop absorbs excess water, leaving the surface slightly ...