You can do it but it will clog up the basket. It can also create excessive wear on the impeller, inside the pool pump.
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Empty the skimmer baskets and the basket that's attached to the pump. Then backwash and rinse the filter.
you may have to prime your pump Clean or replace the filter.
Firstly, the pump is not a sand filter system. The pump is the one with the motor attached and it pumps water not sand. The large round tank is the "sand" filter. You would have to find a skimmer made for vinyl pools with gaskets. It attaches to the wall of the pool and is seen "hanging" from the outside of the pool. The type of pool and equipment have no factor in choosing a skimmer. another good way to go is the Dragonfly Super skimmer this is a floating pool skimmer and only requires a hose to connect it to suction
Starting at the pool first is the static skimmer then the leaf basket then the hair filter basket on the inflow side of the pump then the pipe from the pump to the filter then the pipe from the filter to the pool return The chlorinator sits on the pool return pie at the highest place in the system.
Pour it into the skimmer while the pump is running.
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The best way would be to unplug the swimming pool filter, open the drain valve on your pool filter turn the pump back on and drop the water level to the desired level about 2 inches above the skimmer.
The pool skimmer is the part of the system that the water overflows into for the pump to pump it thru the filter and other accessories. There is usually a screen or mesh basket to catch large debris before it enters the pump. On above ground pools it will be found hanging on the outside of the pool near the top. In-ground pools can have the skimmer placed anywhere along the perimeter with a basket or screen accessible for cleaning.
The direction of the pool circulation: within the pool; water should circulate in a counter clockwise direction. Starting at the skimmer, water travels from the skimmer to the pump (the pump is what makes everything work like the heater etc, from the pump to the filter, thru the heater, thru a chlorinator if you have one , back to the pool.
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
I clean my filter and skimmer basket and leave my pump running. I do not cover my pool. I guess it could depend on the weather in your area and if you have a problem with leaves getting in your pool.
If bugs are'nt filtering out of your pool and you have a filter, obviously your filter is'nt working. Hope this helped. Bugs will naturally swim away from a strong current that is drawing them to a certain point. If the bug is not drawn into either the skimmer or the main drain grate they will never get to the filter. Even then, they will get caught in the skimmer basket or the pump basket. The filter is not intended for catching the bugs - that is what leaf skimmers are for. If thebug is on the bottom of the pool you can then vac it up but still it will only go as far as the pump basket.