The message
from "Franz Heymann" contains these words:

Do you really think anyone is going to sort the PVC from the rottable stuff
when the time comes?

When you dig your garden, do you take all the non-organic matter out?
There is a local authority somewhere oop North (can't unforget where)
which pioneered recycling of household and industrial waste.

One of the operations was to compost anything organic, separate soil,
dust etc, comminute plastics and mix the lot together as soil
conditioner/potting compost.

The plastic pieces acted in the same way as stones in soil: they helped
to retain moisture while facilitating drainage. As a side-benefit, the
compost was much lighter than soil-based ones.

--
Rusty
Open the creaking gate to make a horrid.squeak, then lower the foobar.
http://www.users.zetnet.co.uk/hi-fi/