Blowing Out A Pool Slide Line

by Savannah
(Kewaunee, WI)

We have an underground line leading from the return line of our sand filter to our pool slide. (our pool is a radiant pool. It has only one return line. Piping goes underground as it exits the skimmer. We want to save ourselves the 250.00 and winterize ourselves. Last year we dropped our water level and added pool chemicals. The pool tech blew the lines only.)

The fittings at the pool slide were glued in place by our contractor, there are no fittings that can be disconnected for winterizing it. The water shut off valve for the slide is at the start of the return line at sand filter. Last year we had our pool contractor blow the lines. He did all from the skimmer using a Cyclone. He blew out the pool slide line from that point, but at the time the slide had not been installed and he simply had to turn the supply valve to the slide line, took cap off at the surface of our concrete patio. I took notes as I watched him work, but I forgot to ask how to do the slide when it was installed.

Can a shop vac blow the water from that line up and out the top of the slide? If so, do we also need to somehow block area at the top of the slide where the water comes out so that no water gets into that line over winter? There is a water supply shut off built into the gray, flexible hose that goes up back of slide steps. It is a Smith Typhoon Slide.

Is it better to use a shop vac at skimmer to blow all lines or a large air compressor with hose fitting screwed in at Pentair pump?

Thanks for any advice you can provide.

Thanks for the question Savannah

Many people are confused about a Shop Vac and an air compressor. Both
can be used but when closing a pool, it's more about volume than pressure. Shop Vacs are made for volume and an air compressor is made for pressure. I've never used an air compressor for closing pools, it's always been my Shop Vac because you want to remove the water from the lines gently, not force it out.

As the air bubbles stop at the returns, it's time to screw the cap on. The pressure will naturally build as more returns are capped. I suspect the last would be the slide because of the proximity. Water and air will find the path of least resistance. The last resistance would be, I assume, the slide. If you can, you should cap the slide so water doesn't find it's way into the line.

If possible, you may be able to disconnect the line going from the filter to the slide and blow that out with a Shop Vac. This will ensure that the water is out of the line and ready for Winter.
If you're unable to do this, you can blow the line out from the slide. Just be sure all of the applicable valves are open. You can use a rubber gasket or o-ring to get a good seal.

Hopefully your question was answered to your satisfaction.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Closing/Winterize A Pool" category.

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Hope this helps and have a great Summer.


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