Originally posted by cbrynolf
Now if you have really nasty water than yes I am sure it will make it much clearer for you.
That will be the only way you will see a difference in clarity. Protien skimmers are designed to withdraw DOC's (Disolved Organic Compounds) which are not visible to the human eye unless in extreme concentration.
If you are having issues with water clarity, you may want to think about trying a high quality activated carbon for a couple of days. Running carbon is used to polish the water up and make it clearer, it is also used to absorb harmful compounds and chemicals from the water column.