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I agree with Harriette that a preventive measure is preferable to treatment. It is very likely to be more cost-effective and sustainable. Lead can be removed through distillation and certain filters but that isn't going to be cheap or easy.

In the meantime while you are searching for the source of the lead (and removing/replacing it if possible), first flush diverters might help in reducing some of the pollution entering storage. Metals also tend to sink (as evidenced by high amounts of metal often found in the sludge of RWH tanks), so encourage people to draw water from the top if they aren't already.

I agree with Harriette that a preventive measure is preferable to treatment. It is very likely to be more cost-effective and sustainable. Lead can be removed through distillation and certain filters but that isn't going to be cheap or easy.

In the meantime while you are searching for the source of the lead (and removing/replacing it if possible), first flush diverters might help in reducing some of the pollution entering storage. Metals also tend to sink (as evidenced by high amounts concentrations of metal often found in the sludge of RWH tanks), so encourage people to draw water from the top if they aren't already.