I just bought a house that has a 24' above ground pool and I don't have a clue about how to care for it. The water is green and dirty.

I went to the local pool shop and they wanted to sell me about $200 worth of stuff to get my pool clean.

Is there anyway that I can get my pool clean and clear for MUCH less than the $200 the pool shop wanted me to spend?

Thanks in advance,
Greg