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2. Swimming pool sanitation - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool_sanitation

   Swimming pool contaminants are introduced from environmental sources and swimmers. Affecting primarily outdoor swimming pools, environmental contaminants include windblown dirt and debris, incoming water from unsanitary sources, rain containing microscopic algae spores and droppings from birds possibly harboring disease-causing pathogens. [4]

3. Algaecide - Wikipedia

   en.wikipedia.org/wiki/Algaecide

   Barley straw, in England, is placed in mesh bags and floated in fish ponds or water gardens to help reduce algal growth without harming pond plants and animals. Barley straw has not been approved by the United States Environmental Protection Agency (EPA) for use as a pesticide and its effectiveness as an algaecide in ponds has produced mixed results during university testing in the United ...

4. Organisms involved in water purification - Wikipedia

   en.wikipedia.org/wiki/Organisms_involved_in...

   Rotifers are microscopic complex organisms and are filter feeders removing fine particulate matter from water. They occur naturally in aerobic lagoons, activated sludge processes, in trickling filters and in final settlement tanks and are a significant factor in removing suspended bacterial cells and algae from the water column. [6] [7]

5. State: Toxic blue-green algae found in Lake O, exercise caution

   www.aol.com/state-toxic-blue-green-algae...

   If you have other health questions or concerns about blue-green algae blooms, please call the Florida Department of Health in Okeechobee County at 772-873-4927.

6. Four of Lake Geneva's six beaches remain closed due to ... - AOL

   www.aol.com/four-lake-genevas-six-beaches...

   Blue-green algae will follow sunlight and nutrients by floating to the surface, where they can form thick scum layers or matts and the surface may look bubbly or frothy. Algal scums can be pushed ...

7. Water purification - Wikipedia

   en.wikipedia.org/wiki/Water_purification

   To clean the filter, water is passed quickly upward through the filter, opposite the normal direction (called backflushing or backwashing) to remove embedded or unwanted particles. Prior to this step, compressed air may be blown up through the bottom of the filter to break up the compacted filter media to aid the backwashing process; this is ...