What position for diverter valve..

[Samantha8]

In the winter? How do I close it all off so no water gets back into the pipes? I have the same one in this link, which explains a lot, but not how to close it off entirely.

How To Install a Diverter Valve on the Suction Side of a Pool - INYOPools.com

 

[Samantha8]

Hmmmm...I assume I would close the main drain and then the skimmers would be protected anyways since the water is below the line.

 

[Catanzaro]

Samantha:

Try to keep everything in one post and please add your signature. The main drain is closed by an "air lock". Please read my other thread. The skimmers and returns are closed by plugging them after removing most of the water. I believe that at least 95%, if not more of the water in my pipes is removed when I close. Thanks!

 

[Samantha8]

Samantha:

Try to keep everything in one post and please add your signature. The main drain is closed by an "air lock". Please read my other thread. The skimmers and returns are closed by plugging them after removing most of the water. I believe that at least 95%, if not more of the water in my pipes is removed when I close. Thanks!

So by closing the main drain off at the pump, an air lock is created and no more water can enter? Kind of like an upside down cup?

 

[Catanzaro]

So by closing the main drain off at the pump, an air lock is created and no more water can enter? Kind of like an upside down cup?

When moving water with air through the main drain piping, you will see the water start bubbling, like a whirlpool. After about 60 seconds, I shut off the valve. Depending on how much time is takes to move the water. Some people have reported that this can take up to 5 minutes with smaller types of compressors.

Blowing Out The Pool Main Drain - YouTube

That pool is green, not a TFP pool. LOL!

Main Drain line being winterized - YouTube

This one shows a compressor, hose and fitting. Not the best video, but will give you an idea.

Pool Main Drain Bubbling Winterized - YouTube