It's not possible to add optimizer plus to a pool with the solar cover on. You will need to remove the solar cover from part or all of the pool in order to put optimizer or other pool treatment products into your swimming pool water.
Yes, the solar pool cover does not effect the filter.
It serves no purpose to leave the cover on the pool.
I always left the solar cover on the pool except when I was swimming in it. The solar cover provided enough heat so I did not need to turn on my heater. If the heater pushes the solar cover aside, remove the solar cover from that part of the pool.
Useless
Yes, you can.
Empty the pool and place it upside-down on the cover. Trace with razor.
when you are in the pool
No
The side of the pool cover with bubbles is the lower side.
You shouldn't. The solar cover will keep the chlorine from disolving in the sun. Take the cover off and shock the pool. When the chlorine drops to a normal level cover the pool again if you use a blanket.
locate pool in sunny area, use a solar water heater, solar pool cover, pool heater or enclosed sun room
They are the same thing basically. Pool Cover, Solar Cover, solar Blanket are all used interchangeably. It's basically some material, usually a plastic bubble mesh or vinyl covering that goes over the pool. The exception to this is Winter Cover which generally is heavier and designed to protect your pool during long winter months.