The main purpose of a sand filter is to collect stormwater, rid it of pollutants, and then discharge the water into the storm sewer system. First, water is routed from an impervious surface to the ...

sand, charcoal, and gravel. Next, you need to construct your filter system. Start by cutting the bottom off the water bottle. Then, poke several small drain holes in the lid. The next step is to ...

Upfront costs are higher with DE filters. But, Wells says, “They make up for it in their ability to provide better filtration.” This option features a large tank filled with sand.