I am not sure my liner was that far down but used a heat gun on a small section that is close to where it was attached and kept using the shims to put the liner that slipped out of place, back in, a few inches a day and over a week was able to get it all back in. Also used a slime bag to help filter algae carcasses this year really helped speed up the process (in my opinion) and I may in the future buy bags and modify them as in the post" Trying out the slimebags". more for the ease of cleaning but savings good too. If you order one, you will b probably get it the day your pool clears, LOL. But I use mine occasionally just to see if it collects anything and just had to SLAM again and I feel they help the pool filter clear the pool faster. I have sand filter and do not use DE.