Sea Klear and Bright and Clear are both polymer type clarifiers. I have not used Sea Klear, but it seems to have a good reputation. I only use Bright and Clear if my water has a little haze and needs a little filtering help. This is not very often. Scum Gon is a natural enzyme product that "eats" soaps, oils, etc and eliminates scum. It works well as a weekly additive. Sea Klear also eliminates scum naturally.