Pre-treatment includes strainers in the feed lines to prevent coarse solid impurities clogging the nozzles. The self-cleaning strainers or filters are more efficient and provide an automatic filtration solution. In houses, sink strainers are often used as drain covers in sinks, showers and bathtubs. Some commonly used strainers are bell mouth strainers, foot valve strainers, basket strainers. The silver tableware in the hoard comprises three strainers and 33 spoons, of two types. Tea strainers may also be used for separating milk solids from ghee. This resulted in zinc oxide clogging water strainers, leading to erratic runs and engine failures. These types of strainers are installed in pipeline systems where flow cannot be stopped. There are two common types of strainers. In Europe, flour sacks were used in clothing, quilts, coats and strainers. Their trunks and branches may form an obstruction in the river like strainers. Unlike other types of strainers, it is easy to conduct maintenance on these strainers. There are a few strainers on the creek. Basket Strainers find use in industries where impurities are mostly solids. Strainers are often used in the washing and draining process.