<a href=showthread.php?s=&postid=8576865#post8576865 target=_blank>Originally posted</a> by wds21921
One big thing you will notice is when you go to change your water. If you use white buckets especially, notice the yellow tinge sometimes? When running carbon or Boyd's Chemi-Pure (which I highly recommend) that coloring is gone or almost totally eliminated.
Of course the follow-up question would be what is it (yellow) and is it bad? Well let's put it this way, it didn't go into the tank that way. That's not exactly a highly scientific explanation but try going without just once for a couple months and you'll see why so many people do use it rather than not.
I don't agree it helps keep algae out as much as it eliminates what could possibly feed the algae. Your still going to have algae with or without it.