Mary Fisher wrote:
Has anyone installed a system for flushing the wc using harvested water?

We'd like to be able to switch between mains and pumped collected water.
This would enable harvested water to be used for the garden in summer and
not wasted in winter - when there is more rain to collect but it isn't used.

Spouse has made plans to do it but I wondered if anyone here had done it and
could give the benefits of experience.

Theories and opinions are inappropriate although *authoritative* legal
advice will be welcome. We're confident that we know what's necessary but
there might be something which we hadn't thought of and a qualified plumber
could advise.

TIA

Mary

You will have to be careful not to risk contaminating the potable water
supply. There are water regulations that cover what you can & cannot do
in this area.

Look on the website: http://www.wras.co.uk/

This is the Water Regulations Advisory Service. There are links to the
actual regs from there. Before the flamers start up about regulations,
red tape etc etc. It is in everyones best interest that potable water
supply is strictly regulated.