I just purchased a home with an above ground pool. The pool is 18' X 30' oval with a sand filter, 1.5hp pump and automatic chlorinator and vinal liner. when I purchased the property the sellers told me the problems with the pool. Last spring they purchased the pool so it is fairly new but the company they got it from got it started for them. They followed the process of taking care of the pool through the summer but when the mid fall they ment to close the pool but never did. They did not have it covered and didnt add any chemicals. The first time I saw the pool was in Dec. and the water was clear but a lot of stuff on the bottem, mostely leaves, covered in leaves. In jan. I got the net and got most of the leaves out. As the weather got warmer the pool began to get foggy green and eventally completely green. Kinda a neon green color. I have never owned a pool but had all these chemicals left over from the previous family so I just read the instructions and tried to kinda figure out what to do. First I got the pump and filter going. Then I assumed the green was algie. So I took the algicide, it said 24-36oz's so I put round 33 oz's. in and waited a few hours. Then I Put two bags of shock in and left. Over night The pool realy cleared up and is almost completely clear. But, I ran the net through the water and when it came out there were a couple of tiny wiggly worm like things probably less then 1/4 inch long with a redish color. So I thought maybe there just a few of them so I tried both ends and both sides and was getting them out everywhere. Does anyone know what these are, are they dangerous, and how do I get rid of them. Also shoud I have done somthing differently with the chemicals or do I need to do more. How can I get this pool ready to swim in.