Re: shock level with solid cover when closing?
You're right, proper prep and maint is key. 
My point about safety covers was since solid "safety covers", unlike mesh safety covers, accumulate water on top, they're not a "true" safety cover. Now of course if you are diligent about removing accumulate water, the both offer far more safety than a traditional water bag tarp style cover which can be a death trap.
I should note that there are also "solid" safety covers with a mesh panel in the center that helps prevent water from accumulating on top.
22'x40' Grecian Lazy L 20K gal IG vinyl pool; Aqua Rite SWCG T15 cell; Hayward Pro Grid 6020 DE filter; Hayward Superpump 1hp pump; 12 hrs; Taylor K-2006; city; PF:6
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