This sub is dead

Suprised there aren't more postings here. Am I overlooking a sub?

I dont know if anyone can help me but I have an issue. My pool needs to be cleaned but the waste outlet is too far from the drain (20 Meters), Im not confident enough to remove the pump and take it outside to vacuum the bottom of the pool (I would be worried I would stuff something up). So to buy a flathose it would have to be 20 meters in length and I would also have to add a fitting to the waste outlet OR I could buy a cheap pump that draws enough water to suck from the bottom of the pool. This is about 1 foot from the level of the water in the pool and the pool is about 6 foot deep. If I use it from the side of the pool where the drain is its very close to the pool. Has anyone done this, any suggestions.

I already have all the shock chemicals for it a and floc etc (ill read the instructions for how much to use but I might need help with that too). Its mainly the pumping out the water where I have the issues

In case you were wondering, the heat and sun do affect the chlorine in the pool.