This looks like a duplicate of this thread at TFP where I had already responded. You need to pick ONE forum and stick with it, otherwise you're likely to get confused. Though the advice may be similar in some respects, it might diverge in others and worst of all might be conflicting at different points in time.

As I described in my post in the other thread, the METALfree product and the Polyquat algaecide are completely incompatible and produce a precipitated cloudy mess.

Ben's suggestion of water replacement is probably the fastest and surefire way to get the water clear. If your small pool only has one return, one skimmer, and no floor drain, then it may have terrible bottom circulation. Pointing the return diagonally downwards might help to move the cloudy material to the filter.

Ben, note that the cartridge filter is said to be "large". For the pool not to clear after 24/7 pumping for 4 days, there must either be some tears or bypassing of that cartridge filter (or blowing through it) or the circulation must be terrible in some areas of the pool. Usually the combination of the two polymers is an easily removed precipitate, not a colloid that can't be filtered.