We have problems from nut grass in our area too In fact we aquired our pool because the owner couldn't keep up with the problems. I did a lot of research before we installed. First don't pull it out till your ready to patch. Second you should not have it this soon the ground is supposed to be treated with a powder like Blast it I think thats the name then the base sand put down. We went a little further and used a Gorrilla pad under the liner. If you have leveling issues as well I think it's time to call the installer. In our area they recomend keeping grasses three feet away from pool with a herbacide Sorry to hear about your problems. I hope they can be resolved. You will get alot of advice from others on the forum.
good luck
jennifer
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