If you dont have a vacuum, you will need one whether you have algae or not. They are needed for keeping the bottom of the pool clean (if you dont use a robot or some other type of automatic cleaner). I actually enjoy manual vacuum, but Im still new so I expect that my enjoyment might change with time. Especially when its 11o degrees in the middle of August.
You will also need a vacuum hose to hook up to the vacuum head. Pay attention to the type of plastic end is on the vacuum hose. You want to get the one which has a "swivel" or rotating fitting on one end of the hose. Walmart carries the 35 foot long one for about 38 ish dollars. (lowes where I live have vacuum hose, but not the one with a swivel end). The swivel end lest you move the vacuum around without tying the hose up in a knot.
The swivel end of the hose hooks to the vacuum, the other to the skimmer.
You will prolly have to get the vacuum head either online or at the pool store but you might get lucky and fine one at Lowes or HD. Vacuum heads are made specifically for vinyl or plaster, so be sure to get one for a vinyl pool.
http://www.troublefreepool.com/content/141-visual-encyclopedia-of-pool-equipment
If you have the sort of pole that duraleigh mentined, then the net can be removed from it and a vacuum head or brush installed on the pole.
If you dont have this type of telescoping pole, Lowes carries them for about 22ish dollars
If you have never primed a vacuum hose before, google it on YouTube. You can't just throw the hose in the water, hook it to the skimmer and expect it to work. Good instrcutions on YouTube about priming a vacuum hose.
Good luck with your SLAM.