"If you are commissioning a spa, you already have the access panel off.
I have no
idea what "pump" you are plugging in. "
I don't know what you mean by the term commissioning, as opposed to
draining the water and refilling it, which is required every few
months. From the thread, it seemed like some people are claiming that
you need to bleed air from the system every time the spa is drained. I
didn't say anything about plugging in a pump. What I said was you need
to remove a plug in a pump to bleed it, as pumps usually have drain
plugs and that would seem to be one place you could bleed it. You
could also open unions as you suggested, but I think this is poor
practice as unions were not meant to be repeatidly made and broken.
That is likely to make them more prone to leaking.
"You are correct it isn't rocket science. So why are you trying to
make it sound as if it is? "
I'm not saying it's rocket science. I'm saying that first, in the
spa's I've owned, it's never been necessary. Nor has it ever been
mentioned in the owner's manual. Does your owner's manual say it's
required? If it does, what brand spa do you have?
And second, I don;t have to pull any access covers to drain and change
the water in my spa, so it is extra work for no purpose. Third,
there are certainly spa owners who will feel uncomfortable undoing
unions to bleed the system. There are likely many who don;t even know
what a union is and would have to have a service call. And even with
the power off, depending on what you try to open to bleed the system
and where water may go, it does run some risk of water going where it
shouldn't, like into the power pack.