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Lead (Pb) removal at low cost, primitive island

We're providing RWH (rainwater harvest systems) on a limestone island in Indonesia, very primitive, virtually no machinery, so hard to do boreholes or shallow wells. The RWH method has been going well for local NGO for years. However, lead (Pb) is over 20x the 0.5 standard, both in the rainwater (sample taken from stone and cement mortared tanks) as well as commercial tanker trucks that pump from deep wells.
So we need a low cost simple way to remove the lead. I'm aware that some ceramic filters with silver ion also have activated charcoal and claim lead removal. And there are some other materials that adsorb lead, even cilantro (Science Daily article), though I'm not sure we want to force ppl to drink cilantro-flavored water all the time. ;-) Can you provide some careful studies of low cost simple methods for lead removal? Perhaps comparing the alternatives, pros and cons? Thanks, Stew

Lead (Pb) removal at low cost, primitive island

We're providing RWH (rainwater harvest systems) on a limestone island in Indonesia, very primitive, virtually no machinery, so hard to do boreholes or shallow wells. The RWH method has been going well for local NGO for years. However, lead (Pb) is over 20x the 0.5 standard, both in the rainwater (sample taken from stone and cement mortared tanks) as well as commercial tanker trucks that pump from deep wells.
So we need a low cost simple way to remove the lead. I'm aware that some ceramic filters with silver ion also have activated charcoal and claim lead removal. And there are some other materials that adsorb lead, even cilantro (Science Daily article), though I'm not sure we want to force ppl to drink cilantro-flavored water all the time. ;-) Can you provide some careful studies of low cost simple methods for lead removal? Perhaps comparing the alternatives, pros and cons? Thanks, Stew