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There is more to a dye test, than what I described.

A little cerebral, but excellent:
How To Fix Swimming Pool Leaks

Has his own pool Co. just pick out the areas that apply:
Steve Goodale -...

Thank You for the extra pix's! I can see much better, now that I have my glasses on! ;)
From the pix, your statement is partially incorrect. You have two infeeds, the one you mentioned, that is shut...

Your welcome.

Does the infeed pipe also come through the pad? Does the pad sit directly on top of Ol' blue?

It could have been used as a relief area for the turns/elbows/shutoff valves the...

Although you have lived there for many years, it sounds like you bought the house with the pool. This is why you don't know the purpose of this reservoir.
Can you see from pool side if there are any...

Hi! martialartmom, and Welcome to AMHD :)

Your reservoir may be a pre-filter or chem dispenser, can you send Pix?

Regards... KUXJ