Do I shock or not to bring up chlorine levels. I haven't been able to get any FC since opening the pool 3 weeks ago. Water is crystal clear. We had rain for 2 weeks solid, heavy rain, but water is still clear to the bottom. pH is 7.5, and others are right on ideal range. Just no FC. None. I noticed last night the sides of the pool are starting to get "slick".

Intex AGB 15' x 48". Intex pump and brand new filter. Two 3" chlorine tabs in a floater device (have been in for 8 days).

Any help will be greatly appreciated.