I have an 18 foot round Summer Escape pool with the original in wall skimmer with filter and pump attached. I want to upgrade the pump/filter, do I need to replace the skimmer and purchase a pump/filter unit or can I still use the skimmer and somehow attach a pump/filter unit to it? This is my first above ground pool and it was fine for the first few months, then turned cloudy and I haven't gotten it back in control. I believe part of the problem lies in the not too powerful pump. This will be a project during the fall/winter months.