"Perhaps the union to some pumps is not easily undone, hence the need
for a bleeder. In either case, something has to be loosened to allow
air to escape, so either way you are breaking a 'union'."
No, because a union and a plug are two different things.
"It is not a union that is cemented together,
where I could envision problems arrising from trying to disconnect it.
A union is never cemented together, as the whole purpose of the union
is so that it can be disconnected.
"In the event of a leak, I would personnaly prefer fixing this big nut
then a little bleader screw or something... Same thing, different pile.
They aren't the same thing. A plug you can put tape or pipe dope on to
help seal. A union, you cannot. Also a plug is easy to get a wrench
on and tighten and in my experience, is far less likely to be a source
of a leak.
" While I am getting it running, I have no filter attached, as
it did not come with one. It seems the filter is the first place you
would look for a bleeder valve."
Now I'm confused. The spas I have seen have filters which are part of
the spa, not a seperate attachement, unless they are built in ones.
Mine has a filter housing molded right into the shell, with a lid on
"For the comments about crappy hot tubs, sure, mine is crappy, if thats
what you call it. I now have jet action, nice hot water, and decent
conformt. Its a glorified bucket of water with a pump. With a little
work, I'm sure it will be good as new. Perhaps for 5 - 10k more I could
get a new tub with a bleeder valve, "
I doubt cost has anything to do with it. My spa is a NEMCO, just a
basic spa, nothing fancy. Had it for 17+ years or so. I've never had
to bleed it in any way. And during that time, not only have I drained
it every few months to change the water, I've also moved it from one
location to another, had it sitting on it's side for a couple months,
while I sealed the patio, made repairs, etc. Each time, all I did was
fill it and it fired right up, except once. Then it apparently did
have an air lock problem, but just turning it on and off a couple times
got it going.
I don't doubt that some spas could become air locked, as yours did or
that it might take breaking a connection or opening a plug to get the
air out. I just disagree that all spas require this or that you have
to do it routinely every time the spa is filled.