I had a mustard algae problem as well as a green algae problem in part due to getting my Liquidator dialed in . I began shocking at MA level (37) for my CYA level (65) last Thursday . There is a lot of dead algae (grayish /white) in the bottom of the pool that need to be vacuumed out at this point but , the water still is quite hazy ( I can see the drain and pattern on the liner 9' down ) and it does appear to be getting a little better every day . I read where it can take up to a week to filter out the dead algae . I have not performed the overnight FC loss test at this point but , my CCs have consistently been between 0 and .5 through this whole process . My question is how long must the MA shock level be maintained ? TIA for any thoughts ...