|Small piece of plastic used to keep the cap from touching the bottom of the filter|
They replaced the pebbles and put a piece of screening down. They tested to make sure the sand would not go through the screening. Instead of the bag, they put the sand in a bucket with just one hole. The Tantalus worked and the flow rate was better UNTIL all the air got sucked out and the top bucket become welded to the bottom bucket. A finesse of the design is needed.
Caleb suggested a completely new design. We will consider two teams on Sunday night:one for the new design and one for the current design. We will send a sample of the main bio-filter water to Endyne on Monday for solids testing. This will help us know if we are dealing with actual contaminates or just sand flowing through the filter barriers.