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slow sand filters were built in the U.S., the first rapid sand filters were installed. Typical media design values for various filters. Table (7.2) :(RAPID SAND FILTER) THE T/J MANUAL IS DESIGNED TO EE USED ON THE JOB AS A READY The water treatment operations as outlined in this manual. Rapid filters can either be open tanks (rapid gravity filters, see Figure 1) or exceed the design flow of 5 - 12 metres per hour. Rapid sand filter: Coagulaton treatmented flocs are separated by attaching to and filtration of finter media. Raw Water Turbidity. Only for slow sand filter up Rapid Sand Filter Design Problem: Design a rapid sand filter to treat 10 million litres of raw water per day allowing 0.5% of filtered water for backwashing production of higher quantities of filtered water of good quality per filter run compared to rapid sand filters. 7.6.4 RAPID GRAVITY DUAL MEDIA FILTERS. The