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My ER skimmer which has been producing good skimate, all of the sudden started acting strange. It's filling up the skimmer cup with clear skimate and this happens fairly quickly. What's the cause of this? Is it the air intake tube getting obstructed with salt buildup? What's the remedy?

I know BAR had a group buy for Kent Marin salt a while back. What are people's experiences with the Kent Marin salt? Good Alk and Calc levels?