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Check this site - also concerning ram pumps in Indonesia.
https://www.pseau.org/outils/ouvrages/acf_gravity_fed_system_in_rural_areas_6_hydraulic_ram_pump_systems_2009.pdf
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No.2 Revision
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Check this site - also concerning ram pumps in Indonesia.
https://www.pseau.org/outils/ouvrages/acf_gravity_fed_system_in_rural_areas_6_hydraulic_ram_pump_systems_2009.pdf