A protective coating of colloidal silver is painted on the inside and outside of the filter to kill bacteria.

VOA: special.2009.06.22

The cladding is a weatherproof coating applied to the outside of the buildings which is a few millimetres thick, a housing association spokesman said.

BBC: Tenants' anger after slab falls six floors from Wigan flats

The outside, with its woody shell and velvety green coating, admittedly offers the more attractive vista.

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