misshopeless

Hi guys, I got a big problem. I brought a pool 3 weeks ago. We filled that water, and we haven't been using the pool that much because it was getting green. So i've been procrastionating on cleaning it then it formed algae. I still procrastionated and I believe we got misquito larvae.. We drained the pool and there is only about a few inches left of water left. There is still larvae in the pool though. What should I do?!?! I'm so stressed over this. =( (PS, we didn't use any chemicals or anything, the water was just sitting there) All the pool specs are here: http://www.walmart.com/ip/Intex-18-x-48-Easy-Set-Above-Ground-Pool/15522802 Questions 1. Should we get a (new) filter? If so, which do you recommend? 2.