Waterworks (6): the sand filter building – water drainage after rinsing
After aeration and rinsing of the filter, the impurities and the backwash go into the pipes and then into the desludger. The…

This is a yellow box/bag made by the Swedish postal bank - or postal savings system - which was a stately run bank connected to the also stately run och and controlled Swedish postal system. During the 1960s they made these little boxes/bags that could be purchased by the customers, and it was meant to be used as a home archive system where the user would put the copy of all bills and invoices, and the confirmation letter that the payment had been received.
It looks and is quite simple, just a yellow cardboard box with a plastic handle at the top and two metal locking mechanisms on the front; and it is designed as a bag so that it can be easily transported.
Photo and recording by Erik Pålsson.
After aeration and rinsing of the filter, the impurities and the backwash go into the pipes and then into the desludger. The…
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