5 Steps of Water Purification | LIVESTRONG.COM
Screening. Water from lakes, rivers or the ground passes through a screen as it enters the water treatment plant. When the water source is a lake or river, the screen serves an important function, keeping out large natural contaminants such as plants and wood, or fish.
API Rena Aquarium HOB Power Filters | AAP Super Clean & Smart
FEATURES OF EACH FILTER: The API Rena SmartFilter offers unparalleled functionality, including unique pressurized filtration so water flows through, not over the filter cartridge, resulting in almost no flow-by unlike most aquarium power filters.
Green Stormwater Infrastructure - Philadelphia Water Department
Green stormwater infrastructure includes a range of soil-water-plant systems that intercept stormwater, infiltrate a portion of it into the ground, evaporate a portion of it into the air, and in some cases release a portion of it slowly back into the sewer system.
Water purification - Wikipedia
Groundwater: The water emerging from some deep ground water may have fallen as rain many tens, hundreds, or thousands of years ago. Soil and rock layers naturally filter the ground water to a high degree of clarity and often, it does not require additional treatment besides adding chlorine or chloramines as secondary disinfectants.
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