whats your chlorine level at? do you know what your CYA (stabilizer) level is? your PH level? your alkalinity? without know ing the numbers it is hard to tell you what you need to do fix your pool. also if it is cloudy your filter should be running non stop. shocking is a process not a thing. once you find your cya (stabilizer) level look in watermoms signature, and use "bens guess chart" to bring your chlorine to that level, and KEEP it at the shock level until your pool is clear. the best chlorine is bleach, or liquid chlorine the powders, pucks, tabs, sticks add stuff you dont want or need in your pool. Every year when I open my pool it goes green, but once I go through the shock process - YES just chlorine within 2-3 days my pool is clean, and 4-5 days it is sparkly clear. I havn't brought a sample into a pool store in a long time, and I havn't purchased any product from them (other than liquid chlorine cheapest place in my area). once you levels are balanced maintanence is REALLY simple. at the beginning of the BBB method you'll find yourself testing alot.. but once you get the feel for it, it is easy to do. and ALOT more cost effective than listening to the store.