Systems and methods for purifying natural water for recreational swimming with modular filtration units

A swimming pool comprising at least one hull for receiving a zoned filtration assembly for filtering water comprising a first modular filtration unit, a second modular filtration unit, and a third modular filtration unit,

• wherein each of the first modular filtration unit, second modular filtration unit, and third modular filtration unit comprise:
• at least one modular removable filtration cartridge comprising a plurality of pressed non-woven geotextile fabrics, and a frame assembly for holding the plurality of pressed non-woven geotextile fabrics;
• and
• a filtration container for holding the at least one modular removable filtration cartridge, the filtration container comprising two transverse walls and two longitudinal walls forming a basin,
• the two transverse walls comprising a first transverse wall and a second transverse wall, the first transverse wall having an inlet for receiving water into the filtration container, the inlet disposed proximate to a top of the filtration container, the second transverse wall comprising an outlet for draining water out of the filtration container, the outlet disposed proximate to the top of the filtration container, and
• wherein the water in the filtration container flows substantially longitudinally from the inlet to the outlet, allowing sediment to collect in a bottom area of the basin, and the at least one modular removable filtration cartridge filters the water as it passes through the filtration container,
• wherein water enters the zoned filtration assembly through the inlet of the first modular filtration unit, flows through the outlet of the first modular filtration unit to the inlet of the second modular filtration unit, and flows through the outlet of the second modular filtration unit to the third modular filtration unit, wherein the outlet of the third modular filtration unit outputs filtered water into the swimming pool.

A method for filtering water through a modular filtration unit, the method comprising:

• forming at least one modular removable filtration cartridge, the at least one modular removable filtration cartridge comprising a plurality of pressed non-woven geotextile fabrics, and a frame assembly for holding the plurality of pressed non-woven geotextile fabrics;
• forming a filtration container for holding the at least one filtration cartridges, the filtration container comprising two transverse walls and two longitudinal walls forming a basin, the first wall comprising an inlet for receiving water into the container, the inlet disposed proximate to the top of the container, the second wall comprising an outlet for passing water out of the container, the outlet disposed proximate to the top of the container;
• installing the at least one modular removable filtration cartridge into the filtration container;
• filtering water that enters the inlet of the filtration container, wherein the at least one modular removable filtration cartridge filters the water as it passes through the basin;
• and
• directing the filtered water to a swimming pool.