I have a mesh cover and I open to clear water every year. There's lots of dust on the bottom, but the water is clear.
I would be leery of so much sodium bicarb. I don't have an IG, but the part I'm not familiar with it how you blow the lines and fill them with anti-freeze. The water prep should be no different.
My routine for closing is rather simple.
1) I get the FC up to 12-15 for a couple of days. Vacuum and backwash so it's all nice 'n' clean.
2) add 1 to 2 quarts of polyquat 60%. Wait 48 hours
3) raise FC up to 15ppm again.
4) close.
That's it!
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