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Closing inground pool question-- Blowing out the underground lines--?
I have an inground pool. 2 years ago I paid a company to close it, last year we did it ourselves, and we attempted to do it ourselves again yesterday. We are having trouble blowing out the return line to the pool. When the company did it 2 years ago, they used an air compressor. Last year we used our shopvac on the "blow" setting and it worked fine. And it worked fine yesterday on the intake or skimmer basket portion of the line. However when i blow out from the filter end to the pool, I barely get any bubbles in the pool. What could be wrong? A leak in the line would have caused lots of water loss all summer. The filter worked fine even yesterday when the chemicals were put in. Could there not be enough pressure? why would have it worked last year, and yesterday on the intake line? I live in NY where it does freeze and I am very nervous about what to do. we don't have an air compressor. Can I just put in a ton of antifreeze and let it mix with what water is in there??
It probably is not getting the same amount of air to the returns as it did to the intake lines. There could be a couple of reasons for this.
First, the obvious one: make sure there is a tight seal between the shop vac discharge and the return line. Any air leaking out here will mean less air pressure getting into the line.
Also, how many returns do you have? Try (if you aren't) blowing them out one at a time; put a winterizing plug in the other return(s) and let the air come out of only one return line at a time. Then, move on to the next one. (Only have one plug removed at a time.) And make sure any valves on these lines are fully open.
There could be some kind of obstruction or other problem in the lines or valves causing this too. (Air leaks, or anything of that nature.... except as you say, if this was an ongoing problem, you would have seen symptoms of it by now.)
If all else fails, you can do it the old-fashioned way; drain your pool below the returns and let the water drain out on its own. (Most of the water in the lines should drain out into the pool this way. More time consuming, but it'd work.) Then, once the winterizing plugs are in place, you could fill the pool back up if you wanted to. (Not necessary with a safety cover; you'd probably want to do it with the waterbag-type cover.)
In any case, you should add pool line antifreeze to your plumbing lines. (pool antifreeze is non-toxic, so you won't have to worry about getting it into the pool in the spring.) The industry standard is generally 1 gallon per 10 feet of pipe, but put it whaterver you can get in there (it doesn't seem like I was ever to get that much in when I had my inground pool.)
