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• <br />• <br />• <br />Filtration practices are used to treat runoff by <br />filtering it through media that are designed to <br />capture pollutants through the processes of physical <br />filtration of solids and/or cation exchange of <br />dissolved pollutants. Filtration practices offer many <br />of the same benefits as infiltration, such as <br />reductions in the volume of runoff transported off - <br />site, ground water recharge, increased stream <br />basefiow, and reductions in thermal impacts to receiving waters. Filtration practices also <br />have the added advantage of providing increased pollutant removal benefits. Although <br />pollutant build -up and removal may be of concern, pollutants are typically captured in the <br />upper soil horizon and can be removed by replacing the topsoiL <br />Low impact landscaping. Selection and distribution <br />of plants must be carefully planned when designing a <br />functional landscape. Aesthetics are a primary <br />concern, but it is also important to consider long -term <br />maintenance goals to reduce inputs of labor, water, <br />and chemicals. Properly preparing soils and selecting <br />species adapted to the microclimates of a site greatly <br />increases the success of plant establishment and <br />growth, thereby stabilizing soils and allowing for <br />biological uptake of pollutants. Dense, healthy plant <br />growth offers such benefits as pest resistance <br />(reducing the need for pesticides) and improved soil <br />infiltration from root growth. Low impact <br />landscaping can thus reduce impervious surfaces, <br />improve infiltration potential, and improve the <br />aesthetic quality of the site. <br />