I'm getting ready to plumb up some equipment here and was wondering what everyone's consensus is on fittings and such. I have a pump/filter that will have 1.5" plumbing that's located approximately 25' away from the pool. (I'm placing my equipment under my main covered deck so that it can be away from the pool where I don't have to look at it, and it will be slightly protected from the elements). The plumbing will be underground.
Now I can set this thing up no problem using standard slip fittings and glue - it's really a no-brainer. Where I'm going with this is that I see these setups using unions - I want to take advantage of them and make sure I do this right the first time, but I suppose I don't understand exactly where the best place to put them. So I have to start simple - why use them? I suppose so that certain sections can be removed easily, but from which location and why? Which part of the plumbing do I want to be able to remove? I'll have threaded fittings for the pump and filter, and again for the skimmer and return. I suppose this is where they would be utilized?
I have the system planned out with various 45's (I like to use 45's instead of 90's where I can to cut down on head loss), and ball valves. I can try and provide a system diagram, but I don't think it will help for the super basic question I'm asking here.
Sorry for the dumb question, but you have to start somewhere.