At least there was no ice on the water, like when I opened last year..lol. Start up shock with stabilizer, then baking soda, then Mule Team Borax, then liquid chlorine. 12 hrs of filtering, a bit of vacuuming and it's crysal clear (except metal staining on fiberglas stairs (vit C treatment coming up). Location is Burlington, ON, Canada. Pump comes on automatically at 36 f, so I'm not worried about the odd below freezing overnight temps the next few days.
Pic 1 - opening day (April 2)
Pic 2 - today (April 4) - gotta love it when it's snowing into the pool.
Pic 3 - cold, but clear.