When do you flock a pool?

You flock a pool as a last resort to clear the water. If you cant get the pools water to clear up using normal filtration then you may need to use a floculant. let the pool settle completely for a couple of days. This will cause the impurity's to settle to the bottom of the pool from where you then carefully vacuum the bottom layer of cloudy water to waste. most pool shops wil have the floculant and instructions required for this operation. Have them test your pools water before you do it though.