Extra Valve on Backwash line? What is it? How to use it? Why is it there? Sand filter swimming pool

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So there is often an extra valve fitted to the backwash or waste line on a filter. I show you why it is there how to use it and what it is for.
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40mm 1.5" two way valve. This is a good valve to use to close a waste line.
You can use a 2" 50mm coupling to join to it or 1.5" 40mm pic pipe will glue into it


The Slurpy sand Pump I use now to pump sand from filters: