Check the gasket on your pump basket housing thingee. If that is old, or dry rotted it may be letting air in and causing you to gain the air bubbles.
Attempting to obtain step by step diagrams connecting an above ground pool to a sand filter.
i think its up
If this is an above ground pool you could just pull the old skimmer out cut the rusted section of metal out hit it with some rust converter, replace the section where there is no metal with a new metal forget about the old skimmer setup and replace it with a "floating pool skimmer" they do a better job any way.
Never put any chemical in your skimmer basket. It's not there for that purpose and can be harmful to the filtration system.
The water will spill out through the skimmer, unless the skimmer it is blocked. Otherwise, it will spill over the top. It should not hurt the pool.
18000
make a cut out hole in the deck. make the deck "flush" with the skimmer lid or make it just above and do a removable deck section to hide the skimmer. Also leave enough room between the top pool railing and the deck for liner replacement
I may be wrong but I doubt there is a scum gutter on above ground pools. There may be what is called a skimmer and that is sort of a hollow box like object at one side of the pool - usually located closer to the pool equipment side of the pool. When the pool pump is running you will be able to see water entering the box or skimmer. The purpose of the skimmer is to catch bugs, leaves, etc and to get the water back to the pump. It is part of the circulation system.
No the only thing it will effect is the skimmer and they rarely work too well any way unless you have a floating skimmer. evaporation and splashing will soon take care of it anyway. Rain is free water use it. Draining the pool will also waste pool chemicals.
If you have the regular set up that includes a skimmer, pump and filter then you don't have to waste any water. Get an lid-to-hose adapter, that fits over the skimmer basket at your pool supply store. Fill the hose with water and attach it to the lid. Place the lid inside the skimmer over the skimmer basket, then vacuum to your hearts content. Pool Masters
It has to be filled above the skimmer ( flow to pump) or else the filter will not work. Also, if too low the liner may dry out above the water line and cause it to shrink.
Through above ground/below ground power lines.