A common question I get by email is about the boost pump. Do I need one? What does it do? Why is yours standard with the water maker and others offer it as an option? What if I mount everything below the water line, do I need one then? The question are common enough that I thought a video addressing the issue would be useful. So on a rainy December day while on the Morro Bay, CA mooring ball I pulled out my video camera and started talking about the topic.