|Bag Bottom Completely Open|
|Pre-Filter With Sand Removed|
We finally opted this design: 5 gallon bucket with Tantalus structure from earlier testing (using the cap to build pressure), approx 4 inches of small pebbles, manufactured sand held in a feed bag, and another 5 gallon bucket on top of the sand inside the feed bag. The 5 gallon bucket has 4 holes (the holes were already there--might prefer use 2 holes). The top bucket acts as a storage bucket. It can handle 2 gallons at a time and has a even flow rate. The Tantalus will keep the water in the lower bucket until the water level reaches the top of the filter bucket.
|Pre-filter with Tantalus Attached|
(This brings to question whether the bags in our main filters are working as an effective barrier layer. If they are not holding up as we thought, it explains the sand getting through.)