Today I changed the top section of my design.  I realized that if I needed to pressurize the system, the sytem would have to be able to be closed on all sides.  This forced me to have two buckets on top of each other.  This actually is an improvement because no the top bucket can hold more water while waiting to be filtered.  Once the cermaic filter comes, I can see if the system is water-tight so far.  I also attached the spigot to the bottom bucket.  I used a sealant in an attempt to make that part water-tight.  When it dries I will see if this actually works, or if I have to use another washer.