Okay so I closed the pool over the weekend.
A couple of unexpected things happened. I put the multiport on recirculate thinking this would isolate the connection from pump pipe to returns. Apparently it does not and I got a bunch of DE and waste into the pool. I cleaned up as best I could with my pool robot. I hope that the remnants don't create a breeding ground for algae come spring. So I ended up cleaning the DE filter first and once that was all clean, pumping air into the pipes was no longer polluting the pool water. I ended up adding a floater with chlorine tabs just to be on the safe side and also because it's kinda warm and maybe I closed too early.
I ended up cleaning each blade of the DE filter individually and noticed two of the blades had a small hole. Maybe about half an inch each. So come next spring I will look at how to replace the covers on these blades.
I also broke one of the hoses to my hayward "chlorinator" (used when I go on vacation), so come spring, I will find out how to replace that.
Regarding some of my earlier questions,
For the return plugs I used:
Amazon.com : No. 5 Extended Rubber Winter Plug for 1 Inch Tube : Patio, Lawn & Garden
I lowered the water about 13" which is below one of the returns with a "water feature". The other two returns were a bit lower and would of required me lowering the water another 4-5 inches. I didn't feel comfortable with that so I plugged them while the cyclone was running. Then I went to the pump side opening and poured some pool antifreeze in there.
Interestingly, I tried lowering the water from the main drain.. as this is a question I had on whether it would be possible on anthony/sylvan style pools... and it didn't seem like there was enough suction happening, so I opted to use a sump pump to take out the water below the skimmer line.
For the cyclone to pipe connections I used:
And the hose adapter that came with the cyclone
I had order other things and none of them worked out, but its free returns on amazon...
The connection from cyclone to the 3 ft hose through adapter was snug and I didn't require any clamps to hold it down. The connection from hose to my pipes were not snug and it required 1 person to hold it. Even though a lot of air was coming back at me, there was plenty going to the returns and suction pipes.
Regarding the main drain seal... I was able to get air out of the main drain by inserting the double plug about 95% of the way down. I let that run for 30 seconds and then i pushed in the double plug the rest of the way. I did have water in the skimmer at that time as I had forgotten to clear that. I feel like that was a mistake and I now left water in the skimmer pipe between the top and bottom of the double plug. Should I try to redo this step? I also have no idea if the main drain is properly sealed, I don't think there is any way to know. I guess due to physics there should be an air pocket in that pipe right now and even if there is water, due to pressure and depth, it would be hard for it to freeze? I feel very uncomfortable on these points...
So due to my concerns, should I redo the winterizing of the main drain?