Ok, thanks for clearing that up for me I was finally able to remove the lid from the in line chlorinator so I currently have the trichlor pucks in there. All of this is so very new to me not to mention what seems like a lot of complicating factors. For example, the pressure guage on the sand filter does not work so knowing when to backwash is best guess. The pump is brand new as is the liner but the sand filter hasn't been cleaned, changed or anything in at least 20 yrs so who knows what kind of crap is in there from prior used chemicals and prior "lack of care" for everything related to this pool. Which leaves me with a "where do I even start" confusion!!! Any tips and/or advice is greatly appreciated and needed! Not having the right test kit is pretty frustrating too but I am determined to overcome everything somehow and get it under control.