I did not cover my pool over the winter and possibly did not do the best job of winterizing it. It is green and i cannot see to the bottom so not sure what is down there! Wondering if i can fix this or if it would be best to drain and start over. It may be a bit of a problem to drain as i do not want to kill the grass. Another question is, i still have the original filter/pump that came with the pool. Any suggestions as to an upgrade that would work with this pool. Thank you for any help you can offer.