For the first time in over 25 years of pool keeping, I tried using just the liquid chlorine (instead of 3" pucks) and had dingy green water every few days. Who has time to test and chlorinate water every day (if not twice a day)!
Three weeks ago I went back to using the 3" pucks of chlorine. After I shocked the pool, vacuumed and inserted the pucks, I have chrystal clear water. I believe it's the slow release and level amount of chlorine that works...with my schedule in my pool with this hot summer heat!
Moral of the story: Find what works for you and use it!
Nancy