If you can get the right skimmer you should not have too much of a problem However if you cant get a replacement you may be able to get out of it by getting a floating pool skimmer with inline leaf basket.
Attempting to obtain step by step diagrams connecting an above ground pool to a sand filter.
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.
To attach a hose to the skimmer on an above-ground pool, first ensure the pool pump is off. Locate the skimmer’s suction port, typically found inside the skimmer box. Connect one end of the hose to the skimmer's suction port and secure it tightly to prevent leaks. Finally, run the other end of the hose to your pool pump or vacuum, depending on your intended use.
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To cut holes in the liner for an above-ground pool skimmer, first, ensure the skimmer is properly positioned and marked according to the manufacturer’s instructions. Use a utility knife or a sharp blade to carefully cut along the marked lines, making sure to create a clean, precise opening. It's important to cut slowly to avoid tearing the liner and to wear gloves for safety. After cutting, install the skimmer according to the instructions to ensure a proper seal and prevent leaks.
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
It really depends on the age of the liner. If its 2 or under it can be packed in water and reused. If its older it is impossible and most likely is already dried out from chlorine and sun. To play it safe its easier to start with a new liner. Its difficult to realign the cut out for the skimmer if you have an in the wall skimmer also.
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.